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Over the past 30 years, macroeconomic volatility has declined substantially in most developed countries, characterized in the literature as "The Great Moderation" period. This decline in output volatility captured the attention of macroeconomists, especially because it occurred in numerous developed countries, although the timing and details differ from one country to the other. Among the huge empirical literature on this topic, Kim and Nelson (1999), McConnell and Perez-Quiros (2000), Blanchard and Simon (2001), Stock and Watson (2003), Ahmed, Levin, and Wilson (2004), and Bernanke (2004), among others, document a structural change in the volatility of U.S. gross domestic product (GDP) growth, finding a rather dramatic reduction in GDP volatility since the early eighties. As regards other advanced countries, Mills and Wang (2003), Summers (2005), Stock and Watson (2005), Fang, Miller, and Lee (2008), and Smith and Summers (2009) discover a structural break in the volatility of the output growth rate for the G7 countries, although the break occurred at different times. At a more global level, Cecchetti, Flores-Lagunes, and Krause (2006) examine shifts in the volatility of output growth in 25 advanced and emerging countries and find at least one break in all but nine countries and at most two breaks in six of the 25 countries.

Among the potential factors of this Great Moderation period, the literature put forward (1) "good practices," that is, improved inventory management (e.g., McConnell and Perez-Quiros 2000); (2) "good policies," that is, good monetary policy (e.g., Bernanke 2004; Boivin and Giannoni 2006; Clarida, Gali, and Gertler 2000; Gali and Gambetti 2009); and (3) "good luck," that is, a decline in the volatility of exogenous shocks (e.g., Ahmed, Levin, and Wilson 2004; Stock and Watson 2003, 2005).

However, after years of moderate volatility in output, the recent "Great Recession" throughout the years 2008 and 2009 that affected most of the advanced countries, as well as some emerging countries, in the wake of the global financial crisis, has strongly surprised macroeconomists by its large amplitude. (1) Among the various explanations of this unexpected severity, Stock and Watson (2012) argue that the macroeconomic shocks were much larger than previously experienced, at least for the United States, especially the shocks associated with financial disruptions and heightened uncertainty. This large shocks hypothesis is also supported in a sense by Ferrara, Marcellino, and Mogliani (2015) who show that the Great Moderation does not come with an increase of the nonlinear dynamics within macroeconomic variables, suggesting thus that a linear behavior with shocks may be more appropriate to describe this specific period of time. Some authors also put forward the major accelerating role of international trade (see Baldwin 2009), that contributed to the deepness and the worldwide synchronization of this phenomenon. (2)

A policy-relevant issue is to know whether this Great Recession implies the definitive end of the Great Moderation period or if it can be considered as a short-lived phenomenon with no medium-to-long term impact on the macroeconomic volatility. Indeed if we assume that we entered a new era of high macroeconomic volatility, in conjunction with a new era of lower potential growth (which seems to be the case for many advanced countries, although this is currently a highly debated issue, see, e.g., Reifschneider, Wascher, and Wilcox 2013, as regards the U.S. economy), thus this would lead to more frequent recessions, as defined in the NBER sense, that is, a prolonged and substantial decline in the aggregate level of output. Some studies argue in favor of a shift to a new regime of output growth volatility (e.g., Bean 2010; Canarella et al. 2010; Taylor 2011; Ng and Wright 2013), other evidence suggests that the Great Moderation might not be over (Chen 2011; Gadea, Gomez-Loscos, and Perez-Quiros 2014, 2015; Stock and Watson 2012).

Modeling volatility is challenging for econometricians as it is typically an unobserved phenomena, however with some well-known stylized facts. For example, as shown by Fernandez-Villaverde and Rubio-Ramirez (2010), time-varying volatility, namely periods of high volatility followed by periods of low volatility, is an important feature of macroeconomic times series. To describe fluctuations in volatility, researchers frequently employ some form of generalized autoregressive conditional heteroskedasticity (GARCH) models developed by Engle (1982) and Bollerslev (1986) under the assumption of a stable variance process. Typically, a high degree of persistence in conditional macroeconomic volatility is found in empirical studies. However, it has been also proved that this persistence is often driven by the neglecting of breaks in the variance (see, e.g., Diebold 1986). (3) Indeed, some shocks can cause abrupt breaks in the unconditional variance of returns and are equivalent to structural breaks in the parameters of the GARCH process governing the conditional volatility of returns. Generally those shocks invalidate statistical inference. In such a case, including dummy variables to account for such shifts diminishes the degree of persistence in conditional volatility. For example, using GARCH specifications with breaks in volatility, Fang, Miller, and Lee (2008) and Fang and Miller (2008) show that the time-varying variance falls sharply or disappears, once they incorporate the break in the variance equation of output. Also Balke and Fomby (1991), Atkinson, Koopman, and Shephard (1997) or Darne and Diebolt (2004), inter alia, show that specific events have a dramatic impact on modeling macroeconomic and financial time series. This type of event includes, for example, oil shocks, wars, financial slumps, changes of policy regimes, natural disasters, etc. Due to their unpredictable nature and large impact on macroeconomic and financial relationships, these extraordinary events are referred to as (infrequent) large shocks and are often identified as breaks, jumps, or outliers. Finally, as suggested by Hamilton (2008), even if one's interest is in estimating the conditional mean, correctly modeling the conditional variance can still be quite important, for two reasons: (1) hypothesis tests about the mean in a model in which the variance is mis-specified will be invalid, with a "spurious regression" possibility and (2) the inference about the conditional mean can be inappropriately influenced by outliers and high-variance episodes if one has not incorporated the conditional variance directly into the estimation of the mean, and infinite relative efficiency gains may be possible. (4)

To the best of our knowledge, only one study examines the presence of breaks in mean and in variance to assess the effects of breaks on macroeconomic volatility measurement, including the Great Recession period. Gadea, Gomez-Loscos, and Perez-Quiros (2014) focus only on the United States and identify breaks in mean that can have only a permanent effect and not a temporary effect. In this paper, we identify permanent and temporary breaks for both mean and variance in the GDP series of 10 advanced countries (United States, United Kingdom, Japan, Germany, France, Italy, Canada, Australia, Spain, and the Netherlands). Our empirical results do not give evidence to the end of the Great Moderation period but rather that the Great Recession is characterized by a dramatic short-lived effect on the output growth but not on its volatility, at least for all the countries included in the analysis. Therefore, from our analysis based on recent GDP data, there is currently no evidence of a new regime of high macroeconomic volatility. Then, we show that neglecting the breaks in mean and in variance can lead to spurious econometric results as regards (1) macroeconomic volatility modeling and (2) relationships between output growth and output volatility. We find that the time-varying variance is well modeled by a (G)ARCH process for Canada, France, Italy and Spain, and disappears for Australia, Germany, Japan, the Netherlands, the United Kingdom, and the United States. Finally, we find no relationship between output growth volatility and output growth once we account for breaks, using GARCH-in-mean model.

The remainder of this paper is organized as follows: Section II briefly describes the methodology of break detection for both GDP growth rates and its variance, and presents the results. The effects of breaks on output volatility modeling are presented in Section III. Section IV discussed the growth-volatility relationship. Finally, Section V concludes.


In this section, we present the methodology we implement in order to detect breaks within the GDP series, for both mean and variance, as well as the main empirical results we get. We focus on quarterly growth rates of real GDP series stemming from Quarterly National Accounts of each country, as provided by the OECD in its Economic Outlook database. All the series start in 1970Q1 and end in 2015Q4.

A. Detection of Breaks in Mean

Breaks in macroeconomic series reflect extraordinary, infrequently occurring events or shocks that have major effects on modeling macroeconomic time series. There are several methods stemming from the statistical field for detecting breaks or outliers based on the so-called intervention analysis approach, as originally put forward by Box and Tiao (1975). In this paper, we implement an improved detection algorithm proposed by Chen and Liu (1993), which is readily available with slight modifications in TRAMO/SEATS by Gomez and Maravall (1997). Especially, we focus on break detection from autoregressive moving-average (ARMA) models to emphasize the large shocks that have affected the output growth. Let us assume that we observe ([y.sub.t]) the quarterly growth rate of macroeconomic output which follows the following process:

(1) [y.sub.t] = [z.sub.t] + f(t)



[phi](L)[z.sub.t] = [theta](L)[a.sub.t] [a.sub.t] ~ (0,[[sigma].sup.2.sub.a]),

where [z.sub.t] is an ARMA(p, q) process (5) (L being the usual lag operator), and f(t) contains exogenous disturbances or breaks. Following Chen and Liu (1993), we will consider three various types of breaks: additive outlier (AO), level shift (LS) and temporary change (TC). The specifications for different f(t) are as follows:

AO : [f.sub.AO] (t) = [[omega].sub.AO][I.sub.t] ([[tau].sub.j])LS : [f.sub.LS](t) = [1/(1 L ] [[omega].sub.LS][I.sub.t] ([[tau].sub.j]) TC : [f.sub.TC](t) = [1/(1 - [delta]L)] [[omega].sub.TC][I.sub.t] ([[tau].sub.j]) (3)

where [[omega].sub.i], for i = AO, LS, TC, denotes the magnitude of the break, (6) [I.sub.t] ([[tau].sub.j]) is an indicator function that takes the value of 1 at time t = [[tau].sub.j] and 0 otherwise; [[tau].sub.j] being the unknown date at which the break occurs, with j = 1,..., m, and m is the number of breaks. These various types of breaks differently affect the observations: AO causes an immediate and one-shot effect on the observed series; LS produces an abrupt and permanent step change in the series (permanent shock); TC produces an initial effect which dies out gradually with time (transitory shock). In this latter case, the parameter [delta] controls the pace of the dynamic dampening effect (0 < [delta] < 1). (7) Note also that the detection algorithm provides an estimated date for the break through a sequential procedure. We refer to Appendix S1, Supporting information, for more details on the break detection methodology.

Now we apply this methodology in order to detect outliers on GDP growth rate series for the 10 countries considered in our analysis (United States, United Kingdom, Japan, Germany, France, Italy, Canada, Australia, Spain, and the Netherlands), from 1970Q1 to 2015Q4. (8) In Table 1, all detected breaks are given by country, with their type, timing, and t-statistics. In addition, we also associate the date of each break to a specific event that occurred near that date.

First, we find breaks for all the output growths and many of the detected large negative breaks are associated with the Great Recession. Clearly, all the countries in the sample present a break in mean during this recent macroeconomic recession, except Australia, reflecting thus the large synchronization among advanced countries of this specific event, as shown, for example, by Imbs (2010). This result confirms the findings of Balke and Fomby (1994) and Darne and Diebolt (2004) that severe recessions can be associated with outliers.

More specifically, a sequence of breaks appears among countries: Italy being the first country to be affected in 2008Q2, then Spain and the United Kingdom in 2008Q3, Canada, France, Japan, and the United States in 2008Q4, and last Germany and the Netherlands in 2009Q1. When looking at the amplitude of breaks, Japan was strongly hit through a sequence of two consecutive breaks, as an additive outlier is also detected in 2009Q1. Further, Germany and Japan are among the most affected countries, which seem consistent with economic facts. Indeed, the German and Japanese economies possess an export-led growth that was strongly impacted by the collapse in global trade (see Baldwin 2009).

Another great common feature visible within those results is the type of breaks. Indeed, most of the countries experience a temporary change (TC break) in output growth during the Great Recession period, meaning that the economy was hit by the financial shock but recovers after a few quarters, between two and three quarters. In addition, we get that the estimated pace of recovery was quite low in general as [??] is close to 0.6 or 0.7, except for Italy that recovers at a lower speed ([??] = 0.8). Further, the Great Recession had a very short-lived impact (one quarter) on three countries (Germany, Japan, and the Netherlands) as they experienced an additive outlier. In fact, according to those results, it means that there is no definitive reduction of the output growth after the recession; otherwise a level shift break would have been preferred. (9) This latter result shed some light on the current economic debate about the possible loss of potential growth in the wake of the Great Recession and thus does not imply any evidence that underlying growth has been durably affected by the recession, though there may be a drop in the level of output. This latter hypothesis cannot be assessed here by our approach.

In addition to breaks related to the Great Recession, other breaks are detected within some countries, associated with the first and second oil shocks. The United Kingdom and the United States, oil producers, experienced a positive shock in 1979Q2 and 1978Q2, respectively, and in 1973Q1 (only for the United Kingdom), whereas the negative shocks in 1974Q1 and in 1979Q3 for the United Kingdom are likely due to economic recessions at that time. Last, we point out that the dotcom bubble of the nineties, which was largely financed by equity instead of debt, was much less detrimental to economic growth, as only the United Kingdom and Spain exhibit a short-lived break during this specific period of time. Overall, it turns out that the nature of recession appears to be a strong determinant of the type of break and hence of its macroeconomic impact. A balance sheet crisis, as the last Great Recession was, seems to largely and durably affect the drivers of growth. Finally, the positive shock in 1976Q4 for Australia can be explained by the fact that the inflation in late 1976 is particularly high and that necessitated a change in the monetary policy with the adoption of monetary aggregate targeting. (10)

Note that some important events are not associated with breaks in the mean, suggesting that these events could have an impact on the GDP growth but not large enough to be considered as an extraordinary event; for example, Euro adoption in 1999Q1 for the European countries, the European Union accession (1973Q1 for the United Kingdom; 1986Q1 for Spain), the North American Free Trade Agreement (NAFTA) in 1994Q1 for Canada and the United States, the admission of China to the World Trade Organization (WTO) in 2001Q4, some military conflicts involving some countries of interest (e.g., the Gulf war in 1990-1991, the Bosnian war in 1994-1995, the Iraq war in 2003-2011), or financial crises (the Asian financial crisis 1997-1998, the European sovereign debt crisis in 2009).

We now look at the effect of taking breaks-in-mean into account on some basic statistics. Table 3 presents summary statistics for the output growth variables of all countries, for both original and break-in-mean-adjusted series. As regards the original variables, empirical statistics indicate that none of those series is normally distributed. Australia is more volatile, as measured by standard deviation, than other countries. As regards higher moments of the distribution, France, Germany, and Japan exhibit evidence of significant negative skewness and all the countries display excess kurtosis. Blanchard and Simon (2001) note that the distribution of output growth exhibits excess kurtosis, if large and infrequent shocks occur. This suggests that the evidence of kurtosis may reflect extreme changes in mean and variance of growth rate, such as the Great Moderation and the Great Recession. The Ljung-Box test leads to the presence of serial correlation in the series, except for Germany and the Netherlands. The Lagrange Multiplier test for the presence of ARCH effects clearly indicates that all output growth variables, except Germany and the United Kingdom, show strong conditional heteroskedasticity.

Let us turn now to breaks-in-mean-adjusted series; in order to adjust GDP growth series for breaks in mean, we incorporate the various types of outliers based on dummy variables that take a value of one from each point of structural break onwards and take a value of zero elsewhere. Once breaks are accounted for, measures of non-normality in adjusted series improve, sometimes quite dramatically, reducing excess skewness and excess kurtosis. Excess skewness disappears for France and Japan, implying that the breaks are principally responsible for the asymmetries, but still remains for Germany, and becomes significant for the United States. Excess kurtosis disappears for four countries (Canada, France, Japan and Spain). Therefore, this supports the fact that breaks in mean may cause excess kurtosis in time series, as already pointed out, for example, by Carnero, Pena, and Ruiz (2001). However, it is important to note that evidence of conditional heteroskedasticity is still found for all the break-adjusted series, excluding Germany.

From the comparison of basic statistics, it turns out that accounting for breaks diminishes deviation to normality, which is an expected result. However, this does not stop evidence of ARCH effects at this stage.

B. Detection of Breaks in Variance

Once breaks in mean have been identified, we correct the output growth series from those breaks to get breaks-in-mean corrected series ([z.sub.t]), as defined in Equation (1). We first test for breaks in variance starting from adjusted series ([z.sub.t]) using the Bai and Perron (1998, 2003) approach. (11) Following McConnell and Perez-Quiros (2000) and Stock and Watson (2003, 2005), we assume that, for each country, the GDP growth corrected from breaks in mean follows a linear autoregressive (AR) process such that (12):

(4) [z.sub.t] = [[phi].sub.0] + [p.summation over (i=1)] [[phi].sub.i][z.sub.t-i] + [[epsilon].sub.t],

where [[epsilon].sub.t] is the serially uncorrected error term. The lag order p in the AR(p) model is selected from the Schwarz Bayesian criterion (SBC), with the maximum lags [p.sub.max] = q[(T/100).sup.1/4] where q = 4 for quarterly data. (13)

Once parameters in Equation (4) have been estimated, we test for breaks in variance in the absolute values of the estimated residuals, [[??].sub.t], from the following equation:

(5) [absolute value of [[??].sub.t]] = [alpha] + [u.sub.t]

where [u.sub.t] is the regression error term at time t. (14)

In addition to the Bai-Perron test, we also applied two other well-known break-in-variance detection procedures: the iterative cumulative sum of squares (ICSS) algorithm proposed by Sanso, Arago, and Carrion-i-Silvestre (2004) which is a CUSUM-type test, (15) and the test put forward by Sensier and van Dijk (2004).

The test procedures of Bai-Perron and ICSS are break tests in the unconditional variance, while Sensier-van Dijk use the test for the conditional variance. The estimated breaks detected by those procedures are very close for most of the countries, giving some robustness to the empirical results. In order to define our break-invariance dating, we retain the date that is common to at least two testing procedures. We refer to Appendix S1 for further details on multiple detection procedures and results for breaks in variance.

Results for breaks in variance are presented in the first column of Table 2. (16) We find at least one break in volatility in all countries, except for France and Japan, and two breaks for Spain and the United Kingdom. Most of the breaks in volatility are associated with the well-documented decline in output growth volatility in the eighties (Canada, Italy, the Netherlands, and the United States), characterized in the literature as the "Great Moderation" period. Spain and the United Kingdom experienced a break in volatility almost 10 years later (1993Q3 and 1992Q2, respectively). It is noteworthy that in opposition to the previous results as regards break-in-mean detection, the timing of the decline in volatility is not synchronized, as also pointed out by Cecchetti, Flores-Lagunes, and Krause (2006). This observed pattern suggests that there is no clear common shock underlying those breaks in volatility. However, a different timing for the decline in volatility may be related to different learning of good policies. (17)

Table 2 also displays the comparison of break dates in volatility of GDP growth stemming from our results with those of Fang, Miller, and Lee (2008), Cecchetti, Flores-Lagunes, and Krause (2006), Stock and Watson (2005), and Summers (2005). Break dates estimated through our approach are very much in line with those found by Cecchetti, Flores-Lagunes, and Krause (2006) (18) whereas there is more divergence with break dates estimated by other studie. Note however that the dates estimated for the United States are remarkably consistent among studies. There seems to be also a consensus for Canada, excepting the Stock and Watson (2005) study. Different detection methods and different sample periods can explain those divergences: Summers (2005) uses a Markov-switching model with high and low GDP volatility regimes for quarterly data covering the period 1966Q1-2002Q4; Stock and Watson (2005) test for changes in the variance of AR (Atkinson, Koopman, and Shephard 1997) innovations using the Quandt likelihood ratio on the period 1960Q1-2002Q4; Cecchetti, Flores-Lagunes, and Krause (2006) search for multiple breaks in GDP growth series based on Bai and Perron (1998, 2003) approach from 1970Q1 to 2003Q4; and Fang, Miller, and Lee (2008) use modified iterated cumulative sum of squares algorithm proposed by Sanso, Arago, and Carrion-i-Silvestre (2004) to detect structural change in the variance of output growth on the period 1957Q1-2006Q3. Furthermore, the inclusion within the sample of the Great Recession period can bias the estimation of the break dates if this exceptional period, in terms of amplitude and duration, is not taken into account.

A salient feature of those empirical results lies in the fact that once we account for breaks in mean in GDP time series, then no more breaks in volatility are identified during the Great Recession. This empirical result does not give evidence to the end of the Great Moderation regime, in opposition to the results obtained by Canarella et al. (2010), (19) but rather that the Great Recession has a dramatically temporary negative effect on the output growth but not on its volatility. This finding suggests that the Great Moderation with its low volatility of growth is likely to continue in the upcoming years. This result also confirms the findings of Chen (2011) that there is a very high probability of being in a low-volatility regime since 2009-2010, (20) and the view of Clark (2009) that "macroeconomic volatility will likely undergo occasional shifts between high and low levels, with low volatility the norm." Clark (2009) attributes most of the rise in macroeconomic variability to larger shocks to oil prices and financial markets, or bad luck. In addition, Clark (2009) finds that the increase in volatility during the Great Recession is concentrated in some sectors of the economy (e.g., goods production, investment, and total inflation) whereas the Great Moderation affected all sectors. Moreover, the low volatility of financial market prices since 2011 after the Global Financial Crisis (Chakrabarti and Sen 2012; Charles and Darne 2014) provides complementary evidence that the Great Moderation is still on.


In this section, we assess the impact on modeling of not taking breaks into account, for both conditional mean and conditional variance. As argued by Fernandez-Villaverde and Rubio-Ramirez (2010), modeling volatility is important to understand the source of aggregate fluctuations, the evolution of the economy, and for policy analysis. Further, it is necessary to have an accurate modeling of volatility to propose structural models with mechanisms that generate it (Fernandez-Villaverde and Rubio-Ramirez 2010, 2007; Justiniano and Primiceri 2008). In this respect, we estimate an AR(p)-GARCH model (Bollerslev 1986) for the growth rate series on three datasets: raw data; break-in-mean-adjusted data; and break-in-mean and break-in-variance adjusted data. Indeed, GARCH-type models have proved useful in the measurement of output volatility in the empirical literature.

The conditional mean growth rate is supposed to follow an AR(p) process of the form:

(6) [x.sub.t] = [[phi].sub.0] + [p.summation over (i=1)] [[phi].sub.i][x.sub.t-i] + [[epsilon].sub.t],

where for all t, [x.sub.t] = [y.sub.t] for raw series or [x.sub.t] = [z.sub.t] for break-in-mean corrected series, with

[mathematical expression not reproducible],

The lag order p is selected from the Schwarz Bayesian criterion (SBC) in order to capture growth dynamics and to produce uncorrelated residuals. The parameters should satisfy [omega] > 0, [alpha] [greater than or equal to] 0 and [beta] [greater than or equal to] 0 to guarantee the positivity of the conditional variance. The stationarity of the process (the second-order moment condition) is guaranteed by the restriction [alpha] + [beta] < 1. Ling and McAleer (2002a, 2002b) derived the regularity conditions of a GARCH model as follows: E[[[epsilon].sup.2.sub.t]] = [omega]/1-[alpha] - [beta] < [infinity] if [alpha] + [beta] < 1, and E [[[epsilon].sup.4.sub.t]] < [infinity] if k[[alpha].sup.2] + 2[alpha][beta] + [[beta].sup.2] < 1, where k is the conditional fourth moment of [z.sub.t]. (21) Ng and McAleer (2004) underline the importance of checking these conditions.

The sum of [alpha] and [beta] quantifies the persistence of shocks to conditional variance, meaning that the effect of a volatility shock vanishes over time at an exponential rate. The GARCH models are short-term memory which define explicitly an inter-temporal causal dependence based on a past time path. It is possible to shed light on the speed of the mean reversion process from GARCH parameters, based on the half-life concept. Half-life gives the point estimate of half-life (j) in quarters given as [([alpha] + [beta]).sup.j] = 1/2, so the half-life is given by j = ln(0.5)/ln([alpha] + [beta]), that is, it takes for half of the expected reversion back towards E([[sigma].sup.2]) to occur (Andersen and Bollerslev 1997). When [alpha] + [beta] = 1, an integrated GARCH (IGARCH) model is defined (Engle and Bollerslev 1986), for which the unconditional variance is not finite, implying that the shocks to the conditional variance indefinitely persist.

Table 4 provides the estimation results for the AR(p)-GARCH models. The parameters of the volatility models are estimated by maximizing the (quasi) log-likelihood function from the quasi-Newton method of Broyden, Fletcher, Goldfarb, and Shanno (BFGS). (22) For each country, the best model is given in bold face, owing to the higher value of the log-likelihood. We comment below the results for each of the three datasets.

A. Original Data ([y.sub.t])

The conditions of stationarity and existence of the fourth moment are satisfied for almost all the countries (except for Canada, Italy, the United Kingdom, and the United States), showing that the effect of a volatility shock vanishes over time at an exponential rate. Japan is modeled by a GARCH process and exhibits a slightly high volatility persistence, with persistence estimate of 0.870 and half-life of shocks to volatility near to five quarters, whereas Australia, France, and Germany are modeled by an ARCH process, suggesting a low level of persistence (less than one quarter). Finally, the IGARCH process captures the temporal pattern of volatility for the Netherlands and Spain, implying that the shocks to the conditional variance persist indefinitely. (23)

B. Break-in-Mean-Adjusted Data ([z.sub.t])

When breaks in mean are taken into account, the level of volatility persistence is slightly modified for most of the countries. The value of [alpha] decreases and the value of [beta] increases when the data are cleaned of breaks for Canada, the Netherlands, and Spain, as also found by Carnero, Pena, and Ruiz (2001). Note that the GARCH model did not satisfy the regularity and/or non-negativity conditions from original data for Canada, the Netherlands, Spain, and the United Kingdom but these conditions are satisfied from break-in-mean-adjusted data, except for Italy, suggesting that outliers can bias these conditions. This finding confirms that of Ng and McAleer (2004), showing that outliers can affect the moment conditions of GARCH models. Further, the volatility of output growth for the United Kingdom is now modeled by a GARCH model with a high degree of persistence, [alpha] + [beta] = .970. More interesting, the (G)ARCH effect disappears for Australia, Germany, and the United States when outliers are taken into account, suggesting that a homoskedastic error process is more suitable. Further, the log-likelihood from break-adjusted data is higher than the one from the original data, showing the relevance of taking into account outliers in modeling the output growth, from a goodness-of-fit point of view.

C. Accounting for Break-in-Variance in Break-in-Mean-Adjusted Data ([z.sub.t])

We now consider the break-in-mean-adjusted data ([z.sub.t]) and we estimate the model given by Equation (6) and by the following equation for the conditional variance:

(7) [[sigma].sup.2.sub.t] = [omega] + [alpha][[epsilon].sup.2.sub.t] + [beta][[sigma].sup.2.sub.t-1 + [m.summation over (i=1)] [[omega].sub.i][]

where m is the number of detected breaks in the variance, [] is the dummy variable corresponding to the ith detected break, and [[omega].sub.i] is the impact measure of []. We use the dates of break presented in Table 2. The parameter estimates of dummies variables are all found to be significant. (24) The negative estimate of the dummy variable ([d.sub.1]) in the variance equation reflects exactly the Great Moderation for Canada, Italy, the Netherlands, Spain ([d.sub.2]), the United Kingdom and the United States. For all the countries, the improvement of the value of the maximum log-likelihood (LL) indicates that the GARCH (1,1) model from break-in-mean-adjusted data with structural breaks in volatility appears to be the most relevant to fit the data, showing the importance to account for breaks, both in mean and in variance, when modeling the output growth.

When structural breaks are incorporated in the GARCH model, the volatility persistence substantially drops for Canada, Italy, and Spain, with a level of 0.601, 0.515, and 0.775, respectively (with a decrease of the persistence of almost 30%). It is well known that these shocks can bias the estimated persistence of volatility (see, e.g., Lamoureux and Lastrapes 1990; Mikosch and Starica 2004; Hillebrand 2005). Moreover, the estimated half-life of shocks changes dramatically. For example, the half-life is of nearly four quarters for Canada from the original data, whereas, it is of one quarter after accounting for structural break in variance. That is, once breaks are accounted for, a shock is expected to have a much lower duration. Further, the estimates of GARCH parameters, [[alpha].sub.1] and [[beta].sub.1], not only fall in size but also become nonsignificant in the specification that includes the variance dummy variable for Japan, the Netherlands, and the United Kingdom, indicating no (G)ARCH effects. That is, the dummy variable replaces the GARCH effect. Moreover, the GARCH (1,1) model reduces to ARCH (1) for Italy.

Overall, empirical results presented in this section underline that once we correct for breaks in volatility, then the ARCH (1) model appropriately captures volatility of GDP growth rate for France and Italy, and a GARCH (1,1) for Canada and Spain, whereas conditional homoskedasticity prevails for Australia, Germany, Japan, the Netherlands, the United Kingdom, and the United States. Thus we can conclude from those results that the GARCH evidence and high persistence property that appear in many research papers dealing with macroeconomic variables mainly reflect the Great Recession and the Great Moderation effects. Once taking breaks into account, this specific variance dynamics disappears for some countries.


A number of studies examine the issue of how the volatility of the GDP growth rate affects the growth rate of GDP. That is, does decreased GDP growth rate volatility cause a higher or lower GDP growth rate? Alternative theoretical models give mixed results: negative (e.g., Martin and Rogers 1997, 2000), positive (e.g., Black 1987; Blackburn 1999), or independent relationships (Phelps 1968; Lucas 1972) between output growth volatility and output growth. (25) Empirical evidence of the growth-volatility relationship is also mixed (see, e.g., Caporale and McKiernan 1996, 1998; Fountas and Karanasos 2006) by applying a GARCH-in-mean (GARCH-M) model (Engle et al. 1987). Fang and Miller (2008) and Fang, Miller, and Lee (2008) find no link between volatility and growth by taking into account a structural break in the volatility process.

We re-examine the effect of output volatility on its growth by estimating GARCH-M models using the three datasets considered in the previous section. The mean growth rate is defined as:

(8) [x.sub.t] = [[phi].sub.0] + [p.summation over (i=1)] [[phi].sub.i][x.sub.t-i] + [lambda][[sigma].sub.t] + [[epsilon].sub.t]

where for all t, [x.sub.t] = [y.sub.t] for raw series or [x.sub.t] = [z.sub.t] for break-in-mean-adjusted series, where [[sigma].sub.t] equals the standard deviation of the conditional variance ([[sigma].sup.2.sub.t]), and [lambda] measures the amplitude of the volatility effect. As in Fang and Miller (2008) and Fang, Miller, and Lee (2008), we introduce lagged output growth into the conditional variance equation in the GARCH-M model to avoid potential endogeneity bias. The variance equation is thus given by

(9) [[sigma].sup.2.sub.t] = [omega] + [alpha][[epsilon].sup.2.sub.t-1] + [beta][[sigma].sup.2.sub.t-1] + [theta][x.sub.t-1]

where [theta] measures the level effect of the output growth on the variance. Table 5 displays the GARCH-M estimation results for original data and break-in-mean-adjusted data. For the original data, we find a significant relationship between output volatility and its growth (estimated by [lambda]) for only two countries from a (I)GARCH(1,1)-M model, with a positive relationship for Canada and a negative relationship for Spain. When breaks in mean are taken into account, the growth-volatility relationship disappears for both countries, suggesting that the breaks bias the estimation of this relationship.

Now we incorporate breaks in variance in the GARCH-M model through the following equation: (10)

[[sigma].sup.2.sub.t] = [omega] + [alpha][[epsilon].sup.2.sub.t-1 + [beta][[sigma].sup.2.sub.t-1] + [theta][x.sub.t-1] + [m.summation over (i=1)] [[omega].sub.i]d[i.sub.t],

where m is the number of detected breaks in the variance, [] is the dummy variable corresponding to the ith detected break, and [[omega].sub.i] is the impact measure of [].

When breaks in volatility are incorporated in the estimation on the GARCH-M model, we find no relationship between output volatility and its growth, whatever the country. (26) This result confirms those obtained by Fang and Miller (2008) and Fang, Miller, and Lee (2008). From a macroeconomic point of view, this implies that economic performances, as measured by GDP growth, do not depend on the uncertainty as measured by GDP volatility.


In this paper, we focused on break detection in mean and in variance on output growth for a set of advanced countries, based on statistical test procedures. It turns out that the Great Recession period is characterized by large breaks in mean of transitory nature, while dates of breaks in variance are consistent with the Great Moderation period in the eighties. This leads us to conclude that there is no evidence favoring an end of the low output volatility period, but rather that the Great Recession has a dramatically short-lived effect on the output growth but not on its volatility.

In addition, we showed that neglecting the breaks both in mean and in variance can have large effects on output volatility modeling based on GARCH specifications. We find that the time-varying variance is well modeled by a (G)ARCH process for Canada, France, Italy, and Spain, and disappears for Australia, Germany, Japan, the Netherlands, the United Kingdom, and the United States. Finally, we find no relationship between output growth volatility and output growth once we account for breaks, using GARCH-in-mean model.


AO: Additive Outlier

AR: Autoregressive

ARMA: Autoregressive Moving-Average

BFGS: Broyden, Fletcher, Goldfarb, and Shanno

GARCH: Generalized Autoregressive Conditional Heteroskedasticity

GDP: Gross Domestic Product

ICSS: Iterative Cumulative Sum of Squares

IGARCH: Integrated GARCH

LL: Log-Likelihood

LS: Level Shift

NAFTA: North American Free Trade Agreement

SBC: Schwarz Bayesian Criterion

TC: Temporary Change

WTO: World Trade Organization

doi: 10.1111/ecin.12551

Online Early publication January 16, 2018


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Additional Supporting Information may be found in the online version of this article:

Appendix S1. Online Appendix.

(1.) Reinhart and Rogoff (2009) call the period of the Great Recession and its aftermath the Second Great Contraction, where the First Great Contraction was the Great Depression, whereas Hall (2011) calls this period the Great Slump.

(2.) Recently, Bagliano and Morana (2015) investigated the structural determinants of the Great Moderation and the transition to the Great Recession.

(3.) Kim and Nelson (1999), Mills and Wang (2003), Summers (2005), and Smith and Summers (2009) implement a Markov-switching heteroskedasticity approach with two states to assess volatility in the growth rate of real GDR The GARCH modeling approach provides an alternative to deal with this issue by assuming a constant variance process.

(4.) In the strictest sense, the efficiency of an estimator is determined by the ratio of its minimum possible variance to its actual variance. Only when the ratio is equal to one--that is, when it has the lowest possible variance--is an estimate considered efficient. An estimator is asymptotically efficient if it reaches efficiency with large samples. More generally, an estimator is considered to be efficient if its sampling variance is relatively small, resulting in small standard errors. It follows that some estimators are more efficient than others, and thus the concept of relative efficiency is useful for assessing competing estimators (Andersen 2007). Hamilton (2008) shows that there is a gain in asymptotic efficiency for the estimation of the parameters in the conditional mean when taking into account outliers and high-variance episodes. The relative efficiency gain of estimating by incorporating outliers and high-variance episodes relative to estimating without incorporating these events can become infinite as the sample size grows for typical values of GARCH parameters. See also Harden and Desmarais (2011).

(5.) The orders p and q of the ARMA model are based on specification tests and information criteria.

(6.) More precisely, it is considered that AOs are outliers which are related to an exogenous change in the series with no permanent effects, whereas TCs and LSs are more in the nature of structural changes. TCs represent short-lived shifts in a series with a return to previous levels whereas LSs are more the reflection of permanent shocks. In the remainder of the paper, we use the term "break" for AO, TC, and LS.

(7.) The values of delta cannot be estimated but have to be specified. TRAMO/SEAT chooses in its default option to set delta = 0.7. We have specified different values for delta (between 0.1 to 0.9) and choose the value that minimizes the AIC and SIC criteria. Note that the AO and LS are two boundary cases of a TC, where [delta] = 0 and [delta] = 1, respectively.

(8.) Source: OECD, Main Economic Indicators database.

(9.) Gadea, Gomez-Loscos, and Perez-Quiros (2014, 2015) also find that the US GDP growth rate does not have any structural (permanent) change in the mean.

(10.) For Spain it is more difficult to find an economic event associated with the outliers detected in 1990Q4 and 1991 Q1. These outliers seem to be due to statistical procedures at the National Statistical Institute. These outliers do not appear with the National Accounts (base 2000) while they are present in the National Accounts (base 1995).

(11.) Note that Zhou and Perron (2008) show that if there are changes that are not taken into account in the mean of the series, the test suffers from serious size distortions. We have also applied the procedure to detect additive outlier in variance proposed by Franses and Ghijsels (1999) but we did not find outliers.

(12.) Pena (1990) and Chen and Liu (1993), among others, show that outliers can bias the estimation of ARMA parameters.

(13.) To check for remaining residual autocorrelation, we apply the Ljung-Box test for residual serial correlation to each AR(p) model selected by SBC. If necessary the lag length p is increased until the null of no residual autocorrelation cannot be rejected at the 5% significance level.

(14.) We also used the unbiased estimators of residuals, [square root of ([pi]/2)][absolute value of [[??].sub.t]], as suggested by McConnell and Perez-Quiros (2000), and found the same number of breaks.

(15.) The ICSS procedure has been used by Fang, Miller, and Lee (2008) for the G7 countries and Gadea, Gomez-Loscos, and Perez-Quiros (2014, 2015) for the United States. Gadea, Gomez-Loscos, and Perez-Quiros (2014, 2015) found the same break in variance as our results for the United States in 1984Q1 using the Bai-Perron approach and the ICSS procedure. Note that Rodrigues and Rubia (2011) show that outliers can generate large size distortions in this test, and suggest to identify the variance changes from the outlier-adjusted data. Further, Inclan and Tiao (1994) advise that "it is advisable to complement the search for variance changes with a procedure for outlier detection."

(16.) We find the same breaks in mean and in variance when the sample size ends in 2007Q4.

(17.) We thank the referee for this comment.

(18.) Cecchetti, Flores-Lagunes, and Krause (2006) use the same methodology we applied, namely the Bai and Perron (1998, 2003) test, with a shorter sample size (1970Q22003Q4) and without searching breaks in mean. We tested for breaks in variance on the original series, that is, without non-adjusted break-in-mean series, and found the same break dates than with the adjusted break-in-mean series, except for the second break for the United Kingdom. These results give robustness of our findings on breaks-in-variance dates.

(19.) Canarella et al. (2010) estimate the end of the Great Moderation in 2007, using Markov regime-switching models. Note that the authors still carry some reservations about their findings.

(20.) Chen (2011) employs a Markov regime-switching approach in G7 countries from data ending in 2010Q4.

(21.) Under the assumption of a Normal distribution k = 3, so the condition becomes 3[[alpha].sup.2] + 2[alpha][beta] + [[beta].sup.2] < 1.

(22.) To estimate the GARCH models, we use the package G@RCH7.0for Ox.

(23.) An IGARCH model has been estimated because the stationarity condition of the GARCH model was not satisfied.

(24.) Note that Fang, Miller, and Lee (2008) find non-significant estimates of some dummy variables in the AR and GARCH models.

(25.) See Fang and Miller (2008) for a discussion of the growth-volatility relationship.

(26.) Note that the effect of the lagged growth rate of output on its conditional variance (0) has been found nonsignificant for all the countries.


* We are grateful for useful comments on a previous version of this paper by anonymous referees. Constructive comments from Sandy Suardi are gratefully acknowledged. Amelie Charles and Olivier Darne gratefully acknowledge financial support from the Region des Pays de la Loire (France) through the grant PANORisk.

Charles: Audencia Business School, Nantes, France. E-mail

Darne: LEMNA, University of Nantes, Chemin de la Censive du Tertre, Nantes, France. E-mail

Ferrara: EconomiX, University Paris, and Banque de France, International Macroeconomics Division, Paris, France. E-mail
Large Shocks Detected in the GDP Growth

Country          Date     Type   [delta] (a)   Size

Australia        1976Q1   AO                    0.036
Canada           2008Q4   TC     0.7           -0.021
France           1974Q4   AO                   -0.019
                 2008Q4   TC     0.7           -0.019
Germany          2009Q1   AO                   -0.048
Italy            2008Q2   TC     0.8           -0.023
Japan            I974Q1   AO                   -0.047
                 2008Q4   AO                   -0.036
                 2009Q1   AO                   -0.044
Netherlands      1979Q1   AO                   -0.055
                 1979Q2   AO                    0.052
                 2009Q1   AO                   -0.039
Spain            1990Q4   AO                    0.036
                 1991Q1   AO                   -0.027
                 2008Q3   TC     0.7           -0.020
United Kingdom   1973Q1   AO                    0.042
                 1974QI   AO                   -0.034
                 1979Q2   AO                    0.038
                 1979Q3   TC     0.7           -0.034
                 1990Q3   TC     0.7           -0.021
                 2008Q3   TC     0.6           -0.029
United States    1978Q2   AO                    0.032
                 2008Q4   TC     0.7           -0.025

Country          Date     t-stat   Events

Australia        1976Q1    3.90    Change in monetary policy regime
Canada           2008Q4   -3.84    Great Recession
France           1974Q4   -4.46    Oil shock
                 2008Q4   -4.94    Great Recession
Germany          2009Q1   -5.58    Great Recession
Italy            2008Q2   -3.71    Great Recession
Japan            I974Q1   -4.99    Oil shock
                 2008Q4   -3.78    Great Recession
                 2009Q1   -4.64    Great Recession
Netherlands      1979Q1   -5.57    Oil shock
                 1979Q2    5.35    Oil shock
                 2009Q1   -4.00    Great Recession
Spain            1990Q4    7.38
                 1991Q1   -5.57
                 2008Q3   -4.67    Great Recession
United Kingdom   1973Q1    6.95    Oil shock
                 1974QI   -5.68    Oil shock
                 1979Q2    6.30    Oil shock
                 1979Q3   -6.51    Oil shock
                 1990Q3   -4.15    Recession
                 2008Q3   -6.06    Great Recession
United States    1978Q2    5.17    Oil shock
                 2008Q4   -4.99    Great Recession

(a) [delta] denotes the parameter designed to
model the pace of the dynamic dampening effect
for the outlier TC (0 < [delta] < 1).

TABLE 2 Comparison of Structural Breaks
in Volatility of GDP Growth

                             Break Date

                   Our      Fang, Miller,     Flores-Lagunes,
Country          Results   and Lee (2008)    and Krause (2006)

Australia        1985Q2    --                1984Q3
Canada           1987Q1    1987Q1            1987Q2
France           --        --                --
Germany          --        --                --
Italy            1984Q1    1996Q1            1983Q3
Japan            --        1975Q1            --
Netherlands      1986Q4    --                1983Q4
                 --        --                1994Q3
Spain            1986Q1    --                1985Q2
                 1993Q3    --                1993Q2
United Kingdom   1977Q2    --                1981Q2
                 1992Q2    1991 Q1           1991Q4
United States    1984Q1    1983Q2            1984Q2
Sample size      1970Q2    1957Q1            1970Q2
                 2015Q4    2006Q3            2003Q4
Methodology                CUSUM-type test   Bai-Perron test

                         Break Date

                   Stock and
Country          Watson (2005)       Summers (2005)

Australia        --              1984Q3
Canada           1991Q2          1988Q1
France           1968Q1          1976Q3
Germany          --              --
Italy            1980Q1          1980Q2
Japan            --              1975Q2
Netherlands      --              --
                 --              --
Spain            --              --
                 --              --
United Kingdom   1980Q1          1982Q2
                 --              --
United States    1983Q2          1984Q4
Sample size      1960Q1          1966Q1
                 2002Q4          2002Q4
Methodology      Quandt LR       Markov-switching model

Descriptive Statistics and Tests

                              Mean   St. Dev.
Country          Outlier      (%)      (%)      Skewness

Australia        Original     0.77     0.94      0.223
                 Break-adj.   0.75     0.90      -0.038
Canada           Original     0.68     0.82      -0.132
                 Break-adj.   0.62     0.73      -0.244
France           Original     0.53     0.56     -0.521 *
                 Break-adj.   0.58     0.50      0.211
Germany          Original     0.51     0.99     -0.519 *
                 Break-adj.   0.54     0.92     0.154 *
Italy            Original     0.43     0.87      -0.079
                 Break-adj.   0.47     0.83      0.209
Japan            Original     0.63     1.15     -0.649 *
                 Break-adj.   0.69     1.01      0.088
Netherlands      Original     0.58     1.15      -0.134
                 Break-adj.   0.60     0.97      0.160
Spain            Original     0.63     0.80      -0.019
                 Break-adj.   0.66     0.70      -0.068
United Kingdom   Original     0.57     0.94      0.185
                 Break-adj.   0.71     0.61      0.194
United States    Original     0.69     0.82      -0.272
                 Break-adj.   0.72     0.75     -0.474 *

Country          Outlier      Kurtosis     JB

Australia        Original      1.56 *    20.0 *
                 Break-adj.    0.96 *     7.0 *
Canada           Original      1.17 *    11.0 *
                 Break-adj.     0.31       2.5
France           Original      2.03 *    39.7 *
                 Break-adj.     0.09       1.4
Germany          Original      3.9 *     121.4 *
                 Break-adj.    1.4 *     15.5 *
Italy            Original      1.83 *    25.7 *
                 Break-adj.    1.21 *    12.5 *
Japan            Original      2.11 *    46.9 *
                 Break-adj.     0.10      0.38
Netherlands      Original      5.32 *    216.2 *
                 Break-adj.    2.01 *    31.5 *
Spain            Original      1.28 *    12.4 *
                 Break-adj.     0.21      0.48
United Kingdom   Original      4.63 *    164.2 *
                 Break-adj.    0.97 *     8.3 *
United States    Original      2.09 *    35.5 *
                 Break-adj.    1.32 *    20.1 *

                                 Q (Balke          LM (Balke
Country          Outlier      and Fomby 1994)   and Fomby 1994)

Australia        Original         26.4 *            32.7 *
                 Break-adj.        14.4             19.8 *
Canada           Original         44.6 *            38.1 *
                 Break-adj.       36.7 *            45.3 *
France           Original         110.3 *           23.3 *
                 Break-adj.       111.1 *           20.8 *
Germany          Original          14.1               9.0
                 Break-adj.        9.97               6.2
Italy            Original         61.9 *            26.8 *
                 Break-adj.       59.7 *            64.8 *
Japan            Original         41.7 *            18.4 *
                 Break-adj.       50.3 *            17.1 **
Netherlands      Original          11.0             30.7 *
                 Break-adj.         6.1             37.3 *
Spain            Original         133.4 *           48.5 *
                 Break-adj.       141.9 *           29.7 *
United Kingdom   Original         20.5 *             15.6
                 Break-adj.       17.7 **           32.3 *
United States    Original         39.2 *            17.0 **
                 Break-adj.       36.8 *            29.7 *

Notes: Q (Balke and Fomby 1994) is the Box Pierce statistics
at lag 10 of the standardized residuals. It is asymptotically
distributed as [chi square] (k). where k is the lag length.
LM (Balke and Fomby 1994) is the ARCH LM test at lag 10.
It is distributed as [chi square] (q), where q is the
lag length.

* and **, significant at 5% and 10% level, respectively.

TABLE 4 Estimation Results for GARCH Models

Country       Type                    [[phi].sub.0]   [[phi].sub.1]

Australia     Original                    0.832           0.076
                                         (14.9)          (0.62)
              Outlier-adj.                0.753           0.057
                                         (12.3)          (0.66)
              Outlier-adj. and dum.       0.798           0.072
                                         (13.0)          (0.94)
Canada        Original (a)                0.734           0.380
                                         (9.56)          (4.85)
              Outlier-adj.                0.662           0.432
                                         (8.48)          (6.03)
              Outlier-adj. and dum.       0.652           0.456
                                         (7.92)          (6.38)
France        Original                    0.549           0.317
                                         (7.36)          (4.16)
              Outlier-adj.                0.581           0.328
                                         (8.69)          (4.46)
Germany       Original                    0.535           0.030
                                         (4.82)          (0.35)
              Outlier-adj.                0.542           0.017
                                         (5.01)          (0.20)
Italy         Original (a)                0.522           0.566
                                         (4.44)          (5.05)
              Outlier-adj. (a)            0.543           0.606
                                         (4.74)          (5.72)
              Outlier-adj. and dum.       0.572           0.504
                                         (5.86)          (5.88)
Japan         Original                    0.696           0.119
                                         (4.14)          (1.46)
              Outlier-adj.                0.719           0.152
                                         (5.72)          (1.89)
              Outlier-adj. and dum.       0.897           0.178
                                         (5.09)          (2.24)
Netherlands   Original (b)                0.656           0.090
                                         (5.71)          (0.94)
              Outlier-adj.                0.622           0.107
                                         (5.75)          (1.17)
              Outlier-adj. and dum.       0.610           0.115
                                         (7.50)          (1.39)
Spain         Original (b)                0.703           0.518
                                         (4.49)          (4.83)
              Outlier-adj (b)             0.758           0.464
                                         (4.81)          (4.10)
              Outlier-adj and dum.        0.789           0.461
                                         (6.00)          (4.34)
United        Original (a)                0.685           0.481
Kingdom                                  (5.80)          (3.80)
              Outlier-adj                 0.695           0.168
                                         (15.5)          (2.00)
              Outlier-adj and dum.        0.693           0.142
                                         (15.0)          (1.72)
United        Original (a)                0.818           0.274
States                                   (7.58)          (2.90)
              Outlier-adj                 0.741           0.242
                                         (7.64)          (2.59)
              Outlier-adj and dum.        0.750           0.213
                                         (8.93)          (2.86)

Country       Type                    [[phi].sub.2]   [[phi].sub.3]

Australia     Original                   -0.096           0.085
                                         (-1.16)         (0.87)
              Outlier-adj.               -0.068           0.156
                                         (-0.72)         (2.10)
              Outlier-adj. and dum.       0.015           0.076
                                         (0.18)          (0.99)
Canada        Original (a)


              Outlier-adj. and dum.

France        Original                    0.150
              Outlier-adj.                0.171
Germany       Original                    0.061           0.064
                                         (0.91)          (0.87)
              Outlier-adj.                0.063           0.083
                                         (0.88)          (1.18)
Italy         Original (a)               -0.139           0.192
                                         (-1.57)         (2.26)
              Outlier-adj. (a)           -0.181           0.189
                                         (-2.05)         (2.37)
              Outlier-adj. and dum.      -0.153           0.124
                                         (-2.40)         (2.10)
Japan         Original                    0.115           0.316
                                         (1.38)          (3.35)
              Outlier-adj.                0.043           0.264
                                         (0.57)          (3.82)
              Outlier-adj. and dum.       0.039           0.262
                                         (0.60)          (3.45)
Netherlands   Original (b)                0.209           0.146
                                         (2.81)          (1.89)
              Outlier-adj.                0.169           0.172
                                         (2.16)          (2.11)
              Outlier-adj. and dum.       0.071           0.138
                                         (0.80)          (1.78)
Spain         Original (b)                0.393           0.211
                                         (4.17)          (1.93)
              Outlier-adj (b)             0.285           0.334
                                         (3.21)          (3.28)
              Outlier-adj and dum.        0.291           0.359
                                         (3.20)          (4.46)
United        Original (a)

              Outlier-adj and dum.

United        Original (a)                0.235
States                                   (2.82)
              Outlier-adj                 0.176
              Outlier-adj and dum.        0.272

Country       Type                    [[phi].sub.4]   [omega]

Australia     Original                   -0.211        0.555
                                         (-2.55)      (4.92)
              Outlier-adj.               -0.190        0.724
                                         (-2.47)      (7.79)
              Outlier-adj. and dum.      -0.151        1.406
                                         (-2.03)      (5.34)
Canada        Original (a)                             0.129
              Outlier-adj.                             0.067
              Outlier-adj. and dum.                    0.282
France        Original                                 0.173
              Outlier-adj.                             0.153
Germany       Original                    0.168        0.553
                                         (2.01)       (4.33)
              Outlier-adj.                0.211        0.728
                                         (2.66)       (7.85)
Italy         Original (a)                             0.105
              Outlier-adj. (a)                         0.099
              Outlier-adj. and dum.                    0.611
Japan         Original                                 0.187
              Outlier-adj.                             0.295
              Outlier-adj. and dum.                    0.052
Netherlands   Original (b)                             0.015
              Outlier-adj.                             0.009
              Outlier-adj. and dum.                    1.940
Spain         Original (b)               -0.292        0.008
                                         (-3.17)      (1.35)
              Outlier-adj (b)            -0.272        0.005
                                         (-2.79)      (1.20)
              Outlier-adj and dum.       -0.286        0.060
                                         (-3.27)      (2.55)
United        Original (a)                             0.373
Kingdom                                               (2.84)
              Outlier-adj                              0.10
              Outlier-adj and dum.                     0.833
United        Original (a)                             0.027
States                                                (1.58)
              Outlier-adj                              0.520
              Outlier-adj and dum.                     1.138

Country       Type                    [alpha]   [beta]   [d.sub.1]

Australia     Original                 .301

              Outlier-adj. and dum.                       -0.946
Canada        Original (a)             .449      .372
                                      (2.65)    (2.49)
              Outlier-adj.             .209      .640
                                      (2.58)    (7.78)
              Outlier-adj. and dum.    .112      .489     -0.180
                                      (1.72)    (4.73)    (-2.15)
France        Original                 .325
              Outlier-adj.             .228       --
Germany       Original                 .409       --

Italy         Original (a)             .691      .256
                                      (3.00)    (2.19)
              Outlier-adj. (a)         .685      .265
                                      (2.98)    (2.32)
              Outlier-adj. and dum.    .512       --      -0.435
                                      (2.66)              (-2.98)
Japan         Original                 .267      .603
                                      (2.09)    (4.73)
              Outlier-adj.             .197      .477
                                      (1.86)    (2.38)
              Outlier-adj. and dum.     --        --       0.864
Netherlands   Original (b)             .146      .854
                                      (2.40)     (--)
              Outlier-adj.             .102      .884
                                      (2.22)    (21.2)
              Outlier-adj. and dum.     --        --       -1.62
Spain         Original (b)             .338      .662
                                      (3.97)     (--)
              Outlier-adj (b)          .231      .769
                                      (3.57)     (--)
              Outlier-adj and dum.     .294      .481      0.366
                                      (1.88)    (3.27)    (1.95)
United        Original (a)             .854       --
Kingdom                               (1.74)
              Outlier-adj              .116      .854
                                      (1.76)    (12.4)
              Outlier-adj and dum.      --        --      -0.390
United        Original (a)             .199      .770
States                                (1.80)    (9.39)
              Outlier-adj               --        --

              Outlier-adj and dum.      --        --      -0.914

                                                  [alpha] +
Country       Type                    [d.sub.2]    [beta]

Australia     Original                              .301


              Outlier-adj. and dum.

Canada        Original (a)                          .821

              Outlier-adj.                          .849

              Outlier-adj. and dum.                 .601

France        Original                              .325

              Outlier-adj.                          .228

Germany       Original                              .409


Italy         Original (a)                          .947

              Outlier-adj. (a)                      .951

              Outlier-adj. and dum.                 .512

Japan         Original                              .870

              Outlier-adj.                          .673

              Outlier-adj. and dum.                  --

Netherlands   Original (b)                          1.000

              Outlier-adj.                          .986

              Outlier-adj. and dum.                  --

Spain         Original (b)                          1.000

              Outlier-adj (b)                       1.000

              Outlier-adj and dum.     -0.416       .775
United        Original (a)                          .854
              Outlier-adj                           .970

              Outlier-adj and dum.     -0.278        --
United        Original (a)                          .970
              Outlier-adj                            --

              Outlier-adj and dum.                   --

Country       Type                    Half-life     LL

Australia     Original                  0.58      -230.4

              Outlier-adj.                        -230.1

              Outlier-adj. and dum.               -205.7#

Canada        Original (a)              3.51      -175.8

              Outlier-adj.              4.23      -159.2

              Outlier-adj. and dum.     1.36      -155.6#

France        Original                  0.62      -113.9

              Outlier-adj.              0.47      -98.2#

Germany       Original                  0.78      -217.5

              Outlier-adj.               --       -210.5#

Italy         Original (a)              12.7      -184.1

              Outlier-adj. (a)          13.8      -181.9

              Outlier-adj. and dum.     1.04      -167.9#

Japan         Original                  4.98      -240.0

              Outlier-adj.              1.75      -221.3#

              Outlier-adj. and dum.      --       -219.5#

Netherlands   Original (b)               --       -234.0

              Outlier-adj.              49.2      -205.1

              Outlier-adj. and dum.      --       -201.7#

Spain         Original (b)               --       -109.8

              Outlier-adj (b)                     -104.4

              Outlier-adj and dum.      2.72      -92.7#

United        Original (a)              4.39      -208.9
              Outlier-adj               22.8      -143.0

              Outlier-adj and dum.       --       -138.9#

United        Original (a)              22.8      -184.0
              Outlier-adj                --       -182.4

              Outlier-adj and dum.       --       -156.8

Notes: [alpha] + [beta] measures the volatility persistence.
Half-life gives the point estimate of half-life (j) in days
given as [([alpha] + [beta]).sup.j] = 1/2. The t-statistics
are given in parentheses. The best LL in-sample
criteria are given in bold.

(a) Denotes that the condition for existence
of the fourth moment of the GARCH is not observed.

(b) Denotes that an IGARCH model has been estimated because
the stationarity condition of the GARCH model was not satisfied.

The best LL in-sample criteria are given in #.

TABLE 5 Estimation Results for GARCH-M Models

Country          Type               [[phi].sub.0]   [[phi].sub.1]

Australia        Original               1.020           0.067
                                       (1.28)          (0.58)
Canada           Original               0.433           0.393
                                       (2.84)          (6.70)
                 Outlier-adj.           0.404           0.422
                                       (1.49)          (6.26)
                 Outlier-adj.           0.505           0.457
                   and dum.            (1.72)          (6.36)
France           Original               0.643           0.315
                                       (2.74)          (4.07)
                 Outlier-adj.           0.586           0.327
                                       (2.29)          (4.27)
Germany          Original               0.721           0.027
                                       (3.05)          (0.35)
Italy            Original (a)           0.760           0.467
                                       (5.07)          (4.28)
                 Outlier-adj. (a)       0.772           0.528
                                       (5.22)          (5.26)
                 Outlier-adj.           0.722           0.487
                   and dum.            (4.04)          (5.35)
Japan            Original               0.237           0.128
                                       (0.55)          (1.67)
                 Outlier-adj.           0.225           0.139
                 Original              (0.34)          (1.65)
Netherlands                             0.190           0.183
                                       (0.22)          (1.30)
                 Outlier-adj.           0.523           0.109
                                       (1.45)          (1.97)
Spain            Original (b)           0.988           0.469
                                       (7.79)          (4.99)
                 Outlier-adj. (b)       0.984           0.452
                                       (5.46)          (3.96)
                 Outlier-adj.           0.980           0.398
                   and dum.            (5.21)          (4.06)
United Kingdom   Original (a)           0.712           0.479
                                       (4.84)          (4.25)
                 Outlier-adj.           0.532           0.159
                                       (1.82)          (1.87)
United States    Original               0.800           0.274
                                       (2.14)          (3.12)

Country          Type               [[phi].sub.2]   [[phi].sub.3]

Australia        Original              -0.099           0.093
                                       (-1.20)         (0.89)
Canada           Original


                   and dum.
France           Original               0.160
                 Outlier-adj.           0.172
Germany          Original               0.058           0.063
                                       (0.85)          (0.86)
Italy            Original (a)          -0.122           0.175
                                       (-1.27)         (2.51)
                 Outlier-adj. (a)      -0.183           0.161
                                       (-2.07)         (2.34)
                 Outlier-adj.          -0.130           0.124
                   and dum.            (-1.92)         (2.20)
Japan            Original               0.123           0.309
                                       (1.52)          (3.69)
                 Outlier-adj.           0.054           0.262
                 Original              (0.71)          (3.83)
Netherlands                             0.258           0.176
                                       (2.02)          (1.98)
                 Outlier-adj.           0.170           0.172
                                       (2.19)          (2.13)
Spain            Original (b)           0.368           0.248
                                       (4.12)          (2.66)
                 Outlier-adj. (b)       0.282           0.330
                                       (3.13)          (3.47)
                 Outlier-adj.           0.322           0.344
                   and dum.            (2.99)          (4.57)
United Kingdom   Original (a)


United States    Original               0.221

Country          Type               [[phi].sub.4]   [lambda]

Australia        Original              -0.206       -0.232
                                       (-2.37)      (-0.24)
Canada           Original                            0.441
                 Outlier-adj.                        0.393
                 Outlier-adj.                        0.265
                   and dum.                         (0.53)
France           Original                           -0.215
                 Outlier-adj.                       -0.012
Germany          Original               0.177       -0.222
                                       (2.06)       (-0.97)
Italy            Original (a)                       -0.353
                 Outlier-adj. (a)                   -0.320
                 Outlier-adj.                       -0.262
                   and dum.                         (-0.98)
Japan            Original                            0.521
                 Outlier-adj.                        0.558
                 Original                           (0.73)
Netherlands                                          0.583
                 Outlier-adj.                        0.146
Spain            Original (b)           0.297       -0.984
                                       (-3.75)      (-3.80)
                 Outlier-adj. (b)      -0.271       -0.770
                                       (-3.05)      (-1.27)
                 Outlier-adj.          -0.253       -0.937
                   and dum.            (-3.09)      (-0.88)
United Kingdom   Original (a)                       -0.036
                 Outlier-adj.                        0.325
United States    Original                           -0.063

Country          Type               [omega]   [alpha]   [beta]

Australia        Original            0.573     .272
                                    (4.63)    (1.39)
Canada           Original            0.126     .473      .341
                                    (2.18)    (2.32)    (1.80)
                 Outlier-adj.        0.064     .210      .635
                                    (2.23)    (2.46)    (6.21)
                 Outlier-adj.        0.284     .126      .473
                   and dum.         (2.61)    (1.67)    (4.43)
France           Original            0.178     .303
                                    (4.70)    (1.86)
                 Outlier-adj.        0.155     .224
                                    (6.80)    (2.06)
Germany          Original            0.560     .398
                                    (4.34)    (1.64)
Italy            Original (a)        0.128     .673      .242
                                    (2.17)    (3.37)    (1.97)
                 Outlier-adj. (a)    0.118     .665      .255
                                    (2.22)    (3.30)    (2.29)
                 Outlier-adj.        0.623     .504
                   and dum.         (4.28)    (2.99)
Japan            Original            0.186     .283      .592
                                    (2.20)    (1.95)    (5.55)
                 Outlier-adj.        0.250     .182      .541
                 Original           (2.04)    (1.77)    (2.85)
Netherlands                          0.014     .170      .830
                                    (0.87)    (1.90)     (-)
                 Outlier-adj.        0.009     .101      .885
                                    (1.09)    (2.26)    (21.4)
Spain            Original (b)         0.007     .349      .651
                                    (1.33)    (3.99)     (-)
                 Outlier-adj. (b)    0.005     .241     -.759
                                    (1.17)    (3.22)     (-)
                 Outlier-adj.        0.059     .334      .439
                   and dum.         (2.25)    (1.97)    (1.88)
United Kingdom   Original (a)        0.377     .853
                                    (2.76)    (1.68)
                 Outlier-adj.        0.011     .107      .860
                                    (1.15)    (1.37)    (10.6)
United States    Original            0.027     .179      .781
                                    (1.55)    (1.72)    (9.01)

Country          Type               [d.sub.1]   [d.sub.2]     LL

Australia        Original                                   -230.5

Canada           Original                                   -186.9

                 Outlier-adj.                               -170.1

                 Outlier-adj.        -0.181                 -155.5
                   and dum.          (-2.15)
France           Original                                   -113.9

                 Outlier-adj.                               -98.3

Germany          Original                                   -217.5

Italy            Original (a)                               -175.0

                 Outlier-adj. (a)                           -172.8

                 Outlier-adj.        -0.448                 -167.2
                   and dum.          (-3.04)
Japan            Original                                   -239.1

                 Outlier-adj.                               -220.9
Netherlands                                                 -246.2

                 Outlier-adj.                               -205.0

Spain            Original (b)                                -105.2

                 Outlier-adj. (b)                           -103.2

                 Outlier-adj.         0.394      -0.441     -91.0
                   and dum.          (1.26)      (-1.38)
United Kingdom   Original (a)                               -209.3

                 Outlier-adj.                               -142.6

United States    Original                                   -195.8

Notes: The ARCH-M models are defined as:
[mathematical expression not reproducible].
The t-statistics are given in parentheses.

(a) Denotes that the condition for existence of the
fourth moment of the GARCH is not observed.

(b) Denotes that an IGARCH model has been estimated because
the stationarity condition of the GARCH model was not satisfied.
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Article Details
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Author:Charles, Amelie; Darne, Olivier; Ferrara, Laurent
Publication:Economic Inquiry
Article Type:Abstract
Geographic Code:1USA
Date:Apr 1, 2018

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