Computers and pay.This paper describes the diffusion diffusion, in chemistry, the spontaneous migration of substances from regions where their concentration is high to regions where their concentration is low. Diffusion is important in many life processes. of computer use among jobs in Britain, and shows that the technology is having notable effects on the labour market. By 2006 three in four jobs entailed job-holders using computers, while for two in four jobs computer use was essential. Computing computing - computer skills have a significant impact on pay but, in 2006, much of this effect is interactive with what we term 'influence skills'. The average effect of a unit increase in the Computing Skills index (which ranges from 0 to 4) is to raise pay by an estimated 5.3 per cent and 6.0 per cent for men and women respectively, For men there is an additional 19.2 per cent boost to pay in establishments where at least three quarters of workers are working with computers, compared to establishments where no one uses computers. These effects are greater for those people in jobs with above-average influence skills requirements. Our estimates allow for education, a large number of other generic skills and other conventional controls, which makes them more robust to the critique that they are overestimates because they might suffer from omitted skill bias. IV estimates show only small differences from the OLS OLS Ordinary Least Squares
OLS Online Library System
OLS Ottawa Linux Symposium
OLS Operation Lifeline Sudan
OLS Operational Linescan System
OLS Online Service
OLS Organizational Leadership and Supervision
OLS On Line Support
OLS Online System estimates. We also find that the direct and interactive effects of computer skills and influence skills have risen over the decade, indicating increased scarcity Scarcity
The basic economic problem which arises from people having unlimited wants while there are and always will be limited resources. Because of scarcity, various economic decisions must be made to allocate resources efficiently. .
Keywords: Pay; wages; computing skills; generic skills; information technology
JEL Classifications: J31; 033
Although it is widely claimed that the introduction of information technologies has transformed the nature of employment in the modern era, understanding of how computers have been affecting the lives of workers is far from comprehensive. In this paper we present some new evidence about the growth of computer usage at work. We also investigate the link between computer skills and pay in Britain, which is one of several contentious issues among social scientists attempting to understand the growth of economic inequality
Economic inequality refers to disparities in the distribution of economic assets and income. .
The past ten years have witnessed a major expansion in the use of ICT (1) (Information and Communications Technology) An umbrella term for the information technology field. See IT.
(2) (International Computers and Tabulators) See ICL.
1. (testing) ICT - In Circuit Test. in organisations. Investment in computer software reached 2 per cent of GDP GDP (guanosine diphosphate): see guanine. in 2002 after a 5-year period of rapid growth (Abramovsky and Griffith, 2007) and an accelerated expansion of overall ICT investment from 13 billion [pounds sterling] in 1992 to more than 35 billion [pounds sterling] in 2000 (National Statistics, 2007). Even so, the spread of ICT amongst the UK population was far from complete by 2005, with one in four 16-74 year olds professing pro·fess
v. pro·fessed, pro·fess·ing, pro·fess·es
1. To affirm openly; declare or claim: "a physics major not even basic computing skills, according to according to
1. As stated or indicated by; on the authority of: according to historians.
2. In keeping with: according to instructions.
3. official European Union data; digital access remains differentiated along lines of age and education (Demunter, 2005, 2006).
Recent evidence has shown that the impact of ICT investment on UK productivity is substantial, and that ICT played the dominant role in explaining productivity growth in the 1990s (Crespi et al., 2007; Oulton and Srinivasan, 2005). In the US, the productivity boom since the mid-1990s is strongly linked to ICT investment (Draca et al., 2006). Studies also find that the effects of new ICT projects are especially high in the long term, because of their complementarity with investments in organisational change (Brynjolfsson and Hitt, 2000). With these impacts from such a pervasive and fast-growing new technology, it would seem quite plausible that the required skills should, for a time at least, be scarce, given that access to acquiring the skills is constrained con·strain
tr.v. con·strained, con·strain·ing, con·strains
1. To compel by physical, moral, or circumstantial force; oblige: felt constrained to object. See Synonyms at force.
2. and costly. If the labour market value of the skills is high enough, technology may become part of the process through which income gaps are widened and the low-skilled excluded from rising affluence as a consequence of the 'digital divide'. The rising demand for computer skills contributes to the increased demand for highly qualified workers (Green et al., 2003); and, beyond schooling, if access to acquiring computing skills is adversely distributed (whether by institutional constraints, age, or ability) then the technology becomes a route towards inequality inequality, in mathematics, statement that a mathematical expression is less than or greater than some other expression; an inequality is not as specific as an equation, but it does contain information about the expressions involved. . It is in part for these reasons that computer skills training has been embedded Inserted into. See embedded system. in the school curriculum, and in the life-long learning agenda, and is now a major focus for European Union initiatives. It has long been recognised that computer usage, even at quite simple levels, is associated with higher pay. Raw calculations show that, in 2006, on average computer users (for the moment undifferentiated undifferentiated /un·dif·fer·en·ti·at·ed/ (un-dif?er-en´she-at-ed) anaplastic.
Having no special structure or function; primitive; embryonic. , see below) earned 63 per cent more than non-computer users. But much of this gap is evidently associated with other characteristics--chiefly, prior education--rather than computer skills as such. It is important to try to discover how much (if at all) computing skills have a causal effect on pay, once other factors have been isolated and controlled for. A 'large' impact calls for renewed efforts to support computer skills training, for both egalitarian and efficiency reasons. If the impact is low or nonexistent non·ex·is·tence
1. The condition of not existing.
2. Something that does not exist.
non , policymakers had best look to other factors behind rising inequality, such as inadequate general education or reduced protection for low-paid workers. Yet labour economists have so far failed to come up with a consensual CONSENSUAL, civil law. This word is applied to designate one species of contract known in the civil laws; these contracts derive their name from the consent of the parties which is required in their formation, as they cannot exist without such consent.
2. assessment of the computer's effect. While Krueger (1993), in a seminal seminal /sem·i·nal/ (sem´i-n'l) pertaining to semen or to a seed.
Of, relating to, containing, or conveying semen or seed. paper on the 1980s US labour market, proposed that a pay premium of between 10 and 15 per cent for computer use could explain a substantial part of the rising return to schooling--and while others have confirmed the pay premium in the US and elsewhere--an influential opposing group has held that the computing pay premium is merely a reflection of unobserved ability which would have led computer users to receive higher pay anyway, irrespective of irrespective of
Without consideration of; regardless of.
preposition despite the technology. Put another way, the critique is that the computer revolution affected those workers who were already being paid more by virtue of their occupational or industrial status or of some latent Hidden; concealed; that which does not appear upon the face of an item.
For example, a latent defect in the title to a parcel of real property is one that is not discoverable by an inspection of the title made with ordinary care. but enduring individual quality.
Reconfirmation and extension of Krueger's US evidence has come from a number of studies which range over methods, time and place. Methods vary according to the extent to which they are able to control for the many other characteristics of jobs that could affect both pay and the likelihood of using computers. Three approaches can be used. One can include a large number of job characteristics in an attempt to control for observed heterogeneity het·er·o·ge·ne·i·ty
The quality or state of being heterogeneous.
the state of being heterogeneous. . However, this approach is rare, owing to owing to
Because of; on account of: I couldn't attend, owing to illness.
owing to prep → debido a, por causa de lack of data. One can, alternatively, use instrumental variables to control for the endogeneity of computer usage. Finally, some studies use limited panel data to try to eliminate potential biases attributable to unobserved but fixed heterogeneous characteristics. In the US Goss n. 1. Gorse. and Phillips (2002) find support for a substantial computer skills premium, but their data do not allow extensive controls for either personal or job characteristics. Dunne et al. (2004) find an impact at firm level from investment in computers on wages. There is confirmation also in Canada (Pabilonia and Zoghi, 2005) where controls for fixed effects reduce the estimated computer pay premium for current computer usage to an insignificant amount, but still leave a substantial premium (13 per cent) for computer users that have had average prior experience with computers. For Australia, Borland et al. (2004) find a substantial premium, but the earnings effect is found to be specified better by the number and level of computer skills than by a simple computer use dummy variable This article is not about "dummy variables" as that term is usually understood in mathematics. See free variables and bound variables.
In regression analysis, a dummy variable . Studies in some developing countries are also supportive (e.g. Ng, 2006, for Shanghai, Liu et al., 2004, for Taiwan).
In Britain, several studies find that there is a substantive pay premium for computer users. Arabsheibani et al. (2004), using 1980s data from the British Social Attitudes Survey, found large returns (22-26 per cent), rising to a surprising 37 per cent when seemingly seem·ing
Outward appearance; semblance.
seeming·ly adv. taking account of selection. Arabsheibani and Marin (2006), however, using the 5th sweep of the National Child Development Study (NCDS NCDS National Child Development Study (UK)
NCDS National Center for Disability Services
NCDS National Child Development Survey (UK)
NCDS North Carolina Dental Society
NCDS NASA Climate Data System ) in 1991, report lower estimates ranging from 7-17 per cent. Both these studies use rather old data, which throw little light on recent changes since computers have become pervasive in British jobs (see below), and the authors appear unaware of the existence of more recent data and studies. More pertinent to recent developments is the analysis of Dolton and Makepeace (2004), which makes use of both the 5th (1991) and 6th (2000) waves of the NCDS; they find that during the 1990s there was a computer use premium for women of between 10 and 12 per cent, and for men of between 9 and 13 per cent. Hildreth (2001) finds that e-mail usage carried with it a premium in 1998, but also suggests that much of the premium may be associated with unobserved complementary skills which only some managers choose to use. Finally, Green (1998) and Dickerson and Green (2004), using data from the 1997 and 2001 Skills Surveys, find substantial effects from using computers at different levels. A distinctive finding of the latter studies, which include controls for a large number of job-related variables and use pseudo-panel techniques, is that more sophisticated computer usage brings higher returns, as one might expect. In 2001 the premium ranged from 8-21 per cent depending on the level of computer use.
Set against these confirmatory studies implying a substantial premium are those which claim to show that the premium for computer skills is zero. Frequently cited is the somewhat derisive de·ri·sive
de·ri study by Dinardo and Pischke (1997) which reasoned against Krueger's findings as follows. Using early German data they find that using pencils (or other simple and widely used tools) is associated with a pay differential similar to that for computer use; and, since it is implausible im·plau·si·ble
Difficult to believe; not plausible.
im·plausi·bil to infer that the skill to use pencils causes pay to rise by, say, 13 per cent (they ascribe as·cribe
tr.v. as·cribed, as·crib·ing, as·cribes
1. To attribute to a specified cause, source, or origin: "Other people ascribe his exclusion from the canon to an unsubtle form of racism" the appearance of this gap to unobserved skills), they prefer to believe the same must be true of computers. Unfortunately for this analysis, however, the list of job characteristics is quite attenuated Attenuated
Alive but weakened; an attenuated microorganism can no longer produce disease.
Mentioned in: Tuberculin Skin Test
having undergone a process of attenuation. , so they were unable to investigate whether a more comprehensive data set on jobs would have allowed them to eliminate the pencils premium but not the computer premium (see Dickerson and Green, 2004, who show precisely this effect in Britain). We therefore consider the 'pencils' critique to be unsubstantiated. Nevertheless, the point remains that exclusion of complementary skills from analyses is a pervasive potential source of bias, usually over-estimation, in the coefficients attached to individual skills which, if ignored, can lead to false inferences about the role of computers in generating inequality. Handel (2007) shows that, after including measures of seven detailed job tasks and pre-computing-revolution occupational and industry mean wages in his regressions, the impact of using a pc or terminal in the US in 1991 is very much reduced and in one specification rendered altogether insignificant. An alternative approach is to try to measure computer skills directly. Direct assessment data on computer skills are not currently available for this purpose. Borghans and ter Weel a. & adv. 1. Well.
n. 1. A whirlpool.
1. A kind of trap or snare for fish, made of twigs. (2004) use some indirect, self-assessment measures of skill available in the 1997 Skills Survey (Ashton et al., 1999), and find that the self-assessment measure of computer skill is not related to pay once computer use is controlled for; however, they do not consider the downward bias resulting from the probable considerable measurement error related to self-assessment.
Of some interest are panel studies which with conventional estimators claim to eliminate the biases associated with unobserved personal or job characteristics. Entorff and Kramarz (1997) find, using French data, that fixed effects estimates show much smaller and statistically insignificant pay premia associated with immediate take-up of computers, but report that there is a return of approximately 1 per cent per year of experience using computers. At that rate, it would not take long for the impact of computers to be noticeable. Kuku Kuku may mean:
1. Occurring or completed without perceptible delay: Relief was instantaneous.
2. . However, it seems much more plausible to assume that computing skills take time to acquire, and Entorff and Kramarz's finding confirms this. Second, the possible biases from dynamic misspecification are compounded by the danger of large measurement errors. In the Entorff and Kramarz panel, for example, the date at which computers started to be used is imputed Attributed vicariously.
In the legal sense, the term imputed is used to describe an action, fact, or quality, the knowledge of which is charged to an individual based upon the actions of another for whom the individual is responsible rather than on the individual's by use of an untested recall question in the third year of the panel. In Krashinsky's twins sample the problem is confounded by a small sample size (381 twin pairs, with an unreported number of cases of between-twin differences in computer usage). The standard errors are unsurprisingly high, making it easy to accept a null hypothesis null hypothesis,
n theoretical assumption that a given therapy will have results not statistically different from another treatment.
n that computers have no effect. If, however, the null hypothesis were that the effect is much higher (e.g. the 10 per cent of Krueger's study--why not?) this also could not be rejected, even though the author reports that the impact of computers 'disappeared' (Krashinsky, 2004, p. 88). Third, Dolton and Makepeace (2004) find that conventional panel fixed-effect estimators can be flawed flaw 1
1. An imperfection, often concealed, that impairs soundness: a flaw in the crystal that caused it to shatter. See Synonyms at blemish.
2. by assuming that the impact of computers is homogeneous The same. Contrast with heterogeneous.
homogeneous - (Or "homogenous") Of uniform nature, similar in kind.
1. In the context of distributed systems, middleware makes heterogeneous systems appear as a homogeneous entity. For example see: interoperable network. across groups of computer users and across time. They found different premia among male computer users according to when they started using computers. Fourth, fixed-effects estimators can be downward biased if wages are downwardly rigid, or if computer users are still indirectly paying the cost of acquiring computer skills at around the time that their use of computers is being measured. For these reasons, panel estimates should not necessarily be preferred, in this case, over cross-section estimates that can include a wide range of job characteristics or can otherwise satisfactorily allow for the endogeneity of computer usage.
We have described, so far, what studies have shown about the impact of computers on pay, and found a conflicting story, where estimates range from near zero to very substantial and the implausibly large. The variation across time and place is relevant because there is no reason to expect universally valid findings. Thus, even if Entorff and Kramarz's findings are accepted in full, there is little reason to expect that the valuation of computer skills in France during the 1980s can be a satisfactory basis for analysing the altogether different British labour market twenty years TWENTY YEARS. The lapse of twenty years raises a presumption of certain facts, and after such a time, the party against whom the presumption has been raised, will be required to prove a negative to establish his rights.
2. later. Similarly, Spitz-Oener (2007) finds that, revisiting similar but more recent German data to that which generated the 'pencils effect' rebuttal rebuttal n. evidence introduced to counter, disprove or contradict the opposition's evidence or a presumption, or responsive legal argument. of the computer wage premium, the computer use premium remains robust while the pencils effect had disappeared. The findings in Britain generally indicate that there has been a positive pay premium, yet neither is its magnitude established (which pertains to the issue of whether computers have directly affected the pay distribution), nor whether there is a tendency for computer skills premia to decline as the supply becomes more widespread. Much of the literature in all countries has been handicapped by poor data, in which employees are recorded to be either computer users or non-users, rarely complemented by information on the type of usage, and normally lacking measures of the intensity or level of usage (and hence of the required skills). In most cases, few or no other generic skills are measured and controlled for. Occasionally, researchers have resorted to self-assessment of skills (Borland et al., 2004, and Liu et al., 2004), which can easily be compounded by personality traits.
Finally, the conclusion that ICT's impact on productivity is complementary to investments in organisational change (e.g. Crespi et al., 2007) is not reflected so far in these studies of computers and pay. Yet there is reason to expect such a connection, in that higher-level skills at managerial and professional levels will be associated with being able to bring about organisational change to generate efficient usages of ICT investments. Organisational changes, we know, have tended to be both skill-biased and effort-biased (Caroli and van Reenen, 2001; Green 2004); and ICT investments interact in their impact on productivity with the proportion of graduates at industry level (Bloom et al., 2005). One might also expect the computer skill premium to be complementary to other skills associated with the ability to bring about organisational change.
The literature therefore leaves unsettled a number of issues about the potential role of computers in determining pay in Britain's labour market. This paper will address the questions:
i) As investment in information technologies has proceeded apace, what have been the changes in the prevalence of computer users, and to the level and intensity of computer usage? Which groups have been gearing up the most to using computers at work?
ii) What are the best estimates of how much computer skills are affecting pay in Britain in recent years, and how is the premium changing over time as competence with IT gradually spreads across the population? Are computing skills becoming like driving skills: imperfect imperfect: see tense. but ubiquitous, with little additional scarcity value scarcity value n → valor m de escasez
scarcity value n → valeur f de rareté
scarcity value n → in the labour market?
iii) Is there any evidence that computer skills are complementary to other scarce generic skills, especially those that might be expected to be associated with the ability to bring about efficient organisational change?
Consistent historical and recent data on the deployment of computer skills at work are available from a series of individual surveys that run from the Social Change and Economic Life Initiative (SCELI) in 1986, through the Employment in Britain of 1992, and then the 1997, 2001 and 2006 Skills Surveys. The 1997 Skills Survey was designed in part to deliver some detailed knowledge about the importance of a wide range of activities carried out at work. These data were collected by adapting the methods of job analysis for the purposes of social survey. The outcome of this approach was that it enabled the measurement of the usage of several generic skills, including computing skills. The 2001 and 2006 Skills Surveys are partial repeats of the questionnaire used in 1997, and in particular provide a consistent series of data on computing and the other generic skills.
These surveys targeted the population of 20-60 year-olds in employment (or, in the case of 2006, ages 20-65), using clustered random sampling methods. Achieved samples were all closely nationally representative as judged by comparison with Labour Force Survey benchmarks. (1) In addition, the 2006 survey included over-sampling surveys of Wales Wales, Welsh Cymru, western peninsula and political division (principality) of Great Britain (1991 pop. 2,798,200), 8,016 sq mi (20,761 sq km), west of England; politically united with England since 1536. The capital is Cardiff. , Scotland and the East Midlands The East Midlands is one of the regions of England and consists of most of the eastern half of the traditional region of the Midlands. It consists of the combined area of Derbyshire, Leicestershire, Rutland, Northamptonshire, Nottinghamshire and most of Lincolnshire. , and for the first time included a sample of people in employment in Northern Ireland Northern Ireland: see Ireland, Northern.
Part of the United Kingdom of Great Britain and Northern Ireland occupying the northeastern portion of the island of Ireland. Area: 5,461 sq mi (14,144 sq km). Population (2001): 1,685,267. . This paper focuses only on employees in Britain, and in the trend analyses just on those aged 20 to 60. All analyses incorporate both a design weight that takes account of clustering, household size, and oversampling Creating a more accurate digital representation of an analog signal. In order to work with real-world signals in the computer, analog signals are sampled some number of times per second (frequency) and converted into digital code. , and a non-response weight to take account of a slightly higher non-response rate from males than from females. Data was collected using face-to-face interviews, conducted in people's homes. Full details of methods can be obtained from Gallie et al. (1998), Ashton et al. (1999), and Felstead et al. (2002; 2007).
The general principle which underpins the 'job requirements' approach to skills analysis is the strategy of asking respondents consistent questions about the activities involved in their jobs. Indicators of these activities are then treated as measures of the skills being deployed. The utilisation of computer skills is measured in a number of ways. The simplest indicator is 'Participation' which derives from the (binary) answers to the question 'does your own job involve use of computerised or automated equipment?'. Though this indicator fails to capture the importance and level of sophistication so·phis·ti·cate
v. so·phis·ti·cat·ed, so·phis·ti·cat·ing, so·phis·ti·cates
1. To cause to become less natural, especially to make less naive and more worldly.
2. with which computers are used, the data are available on a consistent basis back to 1986. A second indicator is derived from a question designed to elucidate e·lu·ci·date
v. e·lu·ci·dat·ed, e·lu·ci·dat·ing, e·lu·ci·dates
To make clear or plain, especially by explanation; clarify.
To give an explanation that serves to clarify. whether and how far computing skills are central to the job: 'how important is using a computer, PC, or other types of computerised equipment?'. We refer to this as the 'centrality' of computer use. Answers were on a 5-point scale ranging from 'not at all important/does not apply' to 'essential'. A third indicator captures the level at which computers are used. Respondents are asked to place the way they use computers on one of four levels, ranging from 'straightforward' to 'advanced', with examples being given to anchor each level. Fourth, respondents were also asked, from 2001 onwards on·ward
Moving or tending forward.
adv. also on·wards
In a direction or toward a position that is ahead in space or time; forward.
Adv. 1. , to report the centrality of internet usage. Fifth, respondents reported the proportion of employees in their workplace that used computers.
The Skills Surveys also measure several other generic skills that are used in many different kinds of jobs, in a consistent way from 1997 through 2006. Exploratory factor analyses were used to guide reduction of over 40 items, each measured on a 5-point importance scale, to twelve theoretically-based skills domain indicators. Rather than compute To perform mathematical operations or general computer processing. For an explanation of "The 3 C's," or how the computer processes data, see computer. factor scores, items were grouped as suggested by the factor analysis, and additive additive
In foods, any of various chemical substances added to produce desirable effects. Additives include such substances as artificial or natural colourings and flavourings; stabilizers, emulsifiers, and thickeners; preservatives and humectants (moisture-retainers); and indices were generated to create the variables measuring the utilisation of skill in each of the twelve domains. Additive indices have the benefit of being more easily interpreted in relation to the original item scales, while factor scores contain weighted contributions for all 40 items, albeit with only small weights from the large majority of items not included in each skill domain (Felstead et al., 2007). In this paper we focus in particular on a skill domain--'influence skills'--that we believe is likely to be associated with the successful and effective introduction and deployment of ICT in workplaces. As argued in studies of ICT's impact on productivity, the effect of ICT is likely to be greatest when combined with good work organisation. It follows that computing skills should be complementary to other generic skills in their effects on productivity. In particular, we hypothesise Verb 1. hypothesise - to believe especially on uncertain or tentative grounds; "Scientists supposed that large dinosaurs lived in swamps"
conjecture, hypothesize, speculate, theorise, theorize, hypothecate, suppose that this requires employees both to assess the potential benefits to be gained from successful ICT use and to be able to persuade and influence and educate others in the workplace. Influence skills in our data are derived from the items capturing the importance of: persuading or influencing others; instructing, training or teaching people; making speeches or presentations; writing long reports; analysing complex problems in depth; and planning the activities of others. (2) These items have an acceptable Cronbach's alpha Cronbach's (alpha) has an important use as a measure of the reliability of a psychometric instrument. It was first named as alpha by Cronbach (1951), as he had intended to continue with further instruments. statistic statistic,
n a value or number that describes a series of quantitative observations or measures; a value calculated from a sample.
a numerical value calculated from a number of observations in order to summarize them. of 0.84. We standardise the resulting index, which we simply term Influence Skills, (3) so that the range is from 0 to 4, where 4 would result if the response to all items was 'essential', 0 if all responses were 'not at all important/does not apply'. (4)
3. The growth and distribution of computing and influence skills in Britain
Figure 1 and table 1 show the remarkable invasion of computers into the British workplace over the past twenty years. Taking first the simple measure of 'participation', the proportion of employees using computers by this definition has nearly doubled since 1986, and appears to be heading towards a plateau of just over three quarters of the employee workforce. Over the same period there was a similarly growing proportion of computer-intensive workplaces where at least half the employees are reported to be using computers or automated equipment.
[FIGURE 1 OMITTED]
The mere use of a computer, however, is a very loose indication of the skills being deployed, since computers can vary greatly in their importance for the job and in the level at which they are used. Figure 1 also plots the 'centrality' of computer use to jobs. The proportion of those answering at the top of the scale ('essential') rose from 33-49 per cent between 1997 and 2006. In addition to computers being 'essential' for half of British employees, another quarter of employees rated them as 'fairly important' or 'very important' in 2006.
Our figures for 2006 can be compared with estimates from the recent 'Community Survey on ICT usage in households and by individuals', according to which 74 per cent of employees use computers, internet or e-commerce (Demunter, 2005), comparable with the Skills Survey figure for participation. Moreover, the Community survey documents that 49 per cent of employed persons in the UK were using computers 'in their normal routine' (Demunter, 2006). This UK figure, which is close to the European Union average, (5) is comparable with the Skills Survey figure for centrality. The expanded computer use might have been expected to dilute di·lute
To reduce a solution or mixture in concentration, quality, strength, or purity, as by adding water.
Thinned or weakened by diluting. usage, with progressively lower-level users adopting the technology at easier levels. The third series shows that this did not happen. The proportion of employees who use computers at a 'high' level--either 'complex' or 'advanced' usage--rose from 16 to 23 per cent over 1997 to 2006. Taken as a proportion of computer users only, the increase was from 24 per cent in 1997 to 28 per cent in 2006. Examples of 'complex' use were: using a computer for analysing information or design, including use of computer aided design (application) Computer Aided Design - (CAD) The part of CAE concerning the drawing or physical layout steps of engineering design. Often found in the phrase "CAD/CAM" for ".. manufacturing". or statistical analysis packages; an example of 'advanced' use was using computer syntax syntax: see grammar.
Arrangement of words in sentences, clauses, and phrases, and the study of the formation of sentences and the relationship of their component parts. and/or formulae for programming. Through this time, therefore, not only were more and more employees being joined up to the digital revolution, the preponderance pre·pon·der·ance also pre·pon·der·an·cy
Superiority in weight, force, importance, or influence.
Noun 1. preponderance were progressively being called on to exercise higher-level computing skills. Finally, figure 1 also documents the very rapid recent expansion of internet usage at work. The proportion of jobs where internet usage was essential rose from 14-28 per cent just in the short period from 2001-6.
Table 1 shows something of how computing skills are distributed among the population of employees in Britain. There are relatively small differences between men and women as regards the participation in computer use, though in the past participation used to be greater for women. Now, computing is regarded as 'essential' in 48 and 51 per cent of the jobs done by men and women respectively. There is a much larger difference, however, when it comes to the level of computer usage: the proportions using computers at 'complex' or 'advanced' levels is 28 per cent for men, compared with 17 per cent for women, a differential that has been maintained throughout the decade of rapid ICT expansion. (6) As expected, younger employees are more likely to have computer skills than older workers, though the differences in participation between young and old have narrowed in recent years.
If computer skills affect labour market prospects, it is of some interest to see how those from different educational background vary in their use of computing skills. The differences are unsurprising but stark. In terms of participation, the figure for those with degrees is 71 per cent, compared with just 20 per cent for those holding no qualifications, a gap of 51 percentage points. The absolute differences have been widening over the decade: back in 1997 the equivalent gap was only 40 percentage points. There is also a very large difference in 2006 between educational groups regarding the use of computers at 'high' levels: 42 per cent for graduates, compared for example with 19 per cent for those with just A-level or equivalent.
Table 1 also documents the changes and the distribution of influence skills. Between 1997 and 2001, the Influence Skills index rose from 1.81 to 2.06, a rise of about one quarter of its 1997 standard deviation. This rise is statistically significant (p = 0.000). An alternative way of describing this change (not shown in the table) is to compute the proportion of jobs for which Influence Skills is at least 3, (which is equivalent to the items being on average at least 'very important' in the job). This proportion rose from 17 per cent in 1997 to 23 per cent in 2006. The increase is especially high among managers (34-44 per cent), and among associate professional occupations (23-31 per cent). Thus, influence skills, which we hypothesise to be complementary to the skills needed for the efficient deployment of ICT in workplaces, are rising, and not just because of the generally increasing prevalence of managers and professionals in workplaces. Finally, table 1 also documents that influence skills are, unsurprisingly, very much more widely deployed in the jobs of the highly educated compared with those in lower educational groups; though note that influence skills are growing even in the lower educated groups.
4. The returns to computing and influence skills
Section 3 has documented that the past decade has been a period of rapid deployment of computer skills in workplaces, and has also noted a more modest but still significant increase in the use of influence skills. Moreover, the deployment of both types of skill has been found to be strongly positively related to education level. With such a profound change in workplaces, along with the obvious costs and constraints associated with the acquisition of these skills, it would not be surprising if bottlenecks occur and that the possession of computing skills (and possibly influence skills) acquires scarcity quasi-rents and/or permanent returns in the labour market.
In this section, the aim is to investigate the effect that computer skills have on hourly pay, over and above the normal returns to the education that may have contributed to acquiring computing skills. We do this by estimating standard earnings equations including schooling and a quadratic quadratic, mathematical expression of the second degree in one or more unknowns (see polynomial). The general quadratic in one unknown has the form ax2+bx+c, where a, b, and c are constants and x is the variable. term in work experience, and other conventional controls, and supplementing these with our measures of computing skills. We also investigate whether, and if so how much, any impact of computing skills is effected through the simultaneous deployment of influence skills, as hypothesised above. We do this by interacting the Influence Skills index with our measures of computing skills.
Tables 2 and 3 show our findings in respect of men and women based on the 2006 Skills Survey data. We restrict the analysis to employees only. In each case column (1) is a benchmark earnings regression giving returns to schooling of approximately 6 per cent and 8 per cent for males and females respectively.
Column (2) introduces computing skills. For this purpose we have averaged the indices of computing centrality and of computing level to form a single index (termed simply 'Computing Skills') that ranges from 0 to 4. (7) Justification for this procedure is that the two constituent indices, though conceptually distinct, are closely correlated cor·re·late
v. cor·re·lat·ed, cor·re·lat·ing, cor·re·lates
1. To put or bring into causal, complementary, parallel, or reciprocal relation.
2. ([rho] = 0.78), and can each be seen as proxies for a latent variable In statistics, Latent variables (as opposed to observable variables), are variables that are not directly observed but are rather inferred (through a mathematical model) from other variables that are observed and directly measured. measuring the computing skills needed to perform a job. (8) A one-unit change in the Computing Skills index amounts to 89 per cent and 95 per cent of the standard deviations within the male and female samples respectively. As can be seen, there is a substantial and significant return to Computer Skills, the estimated coefficient coefficient /co·ef·fi·cient/ (ko?ah-fish´int)
1. an expression of the change or effect produced by variation in certain factors, or of the ratio between two different quantities.
2. for the impact of Computer Skills on log pay being 0.146. This implies, for example, that a job requiring use of computer-aided design skills would pay 7.9 per cent (= 0.5 x 100 x [e.sup.0146]-1) more than a job requiring the use of word-processing or spreadsheet skills, assuming that computers were equally important in the two jobs, and that the job-holders had the same amount of education and experience.
It is quite possible, however, that this estimate is upward-biased through omission omission n. 1) failure to perform an act agreed to, where there is a duty to an individual or the public to act (including omitting to take care) or is required by law. Such an omission may give rise to a lawsuit in the same way as a negligent or improper act. of other skills domains also not captured fully by the controls for education and work experience. One way to attempt to obtain an unbiased estimate is through instrumenting Computing Skills. We utilise for this purpose variables capturing whether there have been recent changes in the workplace. Four relevant variables are included, each as 0/1 dummies: whether in the past five years the workplace has introduced new computing equipment, whether it has introduced new communications technology Noun 1. communications technology - the activity of designing and constructing and maintaining communication systems
engineering, technology - the practical application of science to commerce or industry equipment, whether it has introduced other new equipment, and whether the number of employees has been reduced. We maintain that it is plausible that these variables may affect whether computers are being used in a job, but that they would not necessarily have significant direct effects on pay. Both for men and for women, these instruments pass the Hansen J test which allows us to accept the hypothesis that the variables do not directly affect pay; the instruments also strongly identify the deployment of computing skills. For the purpose of the IV estimations, the samples are of necessity restricted to those employees who had been in the same job for the previous five years. (9) As can be seen in column (3) of both tables, the estimated impact of computing skills is a little higher than the OLS estimate in the case of males, and only marginally lower in the case of females. (10) There is, therefore, some support for the view that computing skills are earning a true independent return in the labour market.
In column (4) we investigate whether part of the impact of computing skills is complementary to influence skills which, as hypothesised, may improve the effective use of computers in jobs. We also include our indicator of the intensiveness of computer use in the workplace as a whole. The hypothesis here is that influence skills may interact both with individual computer use and with workplace computer intensity. Our estimates show that the effect of a unit increase in Computer Skills per se on log pay is much reduced though still significant (at 0.063 for men, 0.032 for women). Influence Skills on its own appears to have no significant association with pay. There is, however, a significant interactive effect from Computer Skills and Influence Skills for both men and women, supporting our hypothesis of complementarity. At the mean of Influence Skills, the additional interactive effect on log pay of a unit rise in Computing Skills is 0.037 for men and 0.042 for women.
Moreover, influence skills are complementary also to workplace computing intensity: for both men and women, the Influence Skills index raises pay by an additional significant amount in high-computer-intensive workplaces (where at least three quarters of employees are working with computers or automated equipment), but not in workplaces that are less intensive in computer use. A one point increase in Influence Skills (11) yields an additional 10 per cent pay premium for men, and 4 per cent for women, in the high-computer-intensive workplaces.
In column (5) we examine how far these estimates are robust to the inclusion of the twelve other generic skills indicators available in the Skills Survey data. This exercise pursues further the possibility, already examined in one way through the IV estimates of column (3), that the estimates of computing skills are biased by the omission of other correlated skills which are rewarded in their own right and may have little to do with technology. As can be seen, inclusion of very many skills domains reduces the point estimate of most coefficients including that of computing skills on its own which becomes statistically insignificant. At the mean value of Influence Skills, the combined direct and interactive effect on pay of a one unit rise in computing skills is significant (p = 0.000) and amounts to 5.3 per cent for men and 6.0 per cent for women. Moreover, for women there remains a substantive and significant interaction with Influence Skills. In the case of men, there is an additional significant interactive effect from Influence Skills in high-computer-intensive workplaces. (12)
The next question we wished to investigate is whether the computing skills premium has been changing over time. A rising premium would be an indication of scarcity in the face of the rapidly rising deployment of computing skills documented in Section 3. On the other hand, one might expect that, as familiarity with computers spreads through the population, the link with pay would be reduced.
Tables 4 and 5 present estimates for men and women of the returns to computing and influence on a consistent basis in each of the three Skills Survey years: 1997, 2001 and 2006. Each regression includes all available controls, including those of multiple other generic skills domains. Workplace computer intensity, however, is excluded as this question was not asked in 1997.
Both tables show an increasing extent to which Computer Skills and Influence Skills interact to affect pay. While in 2006 the interaction is substantial and significant (as found in tables 2 and 3), the estimated coefficient is smaller and insignificant in 2001, and in 1997 carries a small negative but insignificant estimate. In parallel, the estimates of the direct effects of Computer Skills and Influence Skills decrease over time. On average, the overall impact of Computer Skills on pay has increased over the period. Evaluated at the mean level of Influence Skills for the whole decade (2.03 for men, 1.89 for women) the direct and interactive effect of a unit increase in Computing Skills on pay is estimated to have risen from 5.0 per cent in 1997 to 7.2 per cent in 2006 for men, and from 4.4 per cent in 1997 to 7.7 per cent in 2006 for women. For those men and women in jobs with above average Influence Skills, the Computer Skills premium rose faster than for those in jobs that use below-average Influence Skills.
It thus transpires that the interaction between computing and influence skills is a very recent phenomenon. There is indeed some evidence that the rapid diffusion of ICT in British workplaces over the past decade is placing an increasing premium on those who have been able to acquire the skills to utilise the new technologies; but it is predominantly pre·dom·i·nant
1. Having greatest ascendancy, importance, influence, authority, or force. See Synonyms at dominant.
2. those jobs that also deploy high levels of influence skills (where, we have reasoned, the technologies are likely to be used more effectively) that are now being rewarded with a scarcity premium for computing skills.
If all computers did to jobs were to put keyboards under the fingers of clever people who previously grasped pens and were always highly paid, there would be no need to worry about any effects of scarce computer skills on inequality. If, however, computer skills are costly to acquire but the expense is least, and access greatest, for better-educated and more advantaged groups in society, then the computer revolution can be seen as materially affecting the wage structure and as a potential source of greater inequality.
Our findings are consistent with the view that the diffusion of computing technology through the British economy is having notable effects on the labour market. There has been a remarkable rise in the proportions of jobs participating in the use of computers, to the extent that in 2006 three in four jobs entailed job-holders using computers, while for two in four jobs computer use was 'essential'. At the same time, the level of computer use, far from being diluted di·lute
tr.v. di·lut·ed, di·lut·ing, di·lutes
1. To make thinner or less concentrated by adding a liquid such as water.
2. To lessen the force, strength, purity, or brilliance of, especially by admixture. by an influx of users facing only basic skills requirements, has risen. Computing skills requirements are, unsurprisingly, much higher for those with more education behind them. Moreover, there is no sign of any narrowing in the computer skills gap, and indeed the gap appears to be widening. For example, the 'centrality' of computing--the proportions for whom computers are essential--increased over 1997-2006 by 17 percentage points for those educated to degree level, but by only 6 percentage points for those with no qualifications.
We have found that computing skills have a significant impact on pay but, in 2006, much of this effect is interactive with influence skills which we have argued to be complementary to computing skills in their effects on performance. Influence skills, which the data show cluster together in jobs, involve persuading or influencing others, instructing, training or teaching people, making speeches or presentations, writing long reports, analysing complex problems in depth, and planning the activities of others. Our best estimate of the average combined direct and interactive effect of a unit increase in the Computing Skills index (which ranges from 0 to 4) is that this raises pay, after allowing for many other skills and conventional controls, by 5.3 per cent and 6.0 per cent for men and women respectively. To place this in the context of a concrete example, a job where a computer was described as 'very important' and was used for computer-aided design, would pay 16 per cent more than an otherwise identical job that required no computer use at any level. However, the effects are greater than for those people in jobs with above-average Influence Skills requirements. Moreover, for those people with average Influence Skills there is an additional boost to pay in establishments where at least three quarters of workers are working with computers, compared to establishments where no one uses computers: this boost amounts to an estimated 19.2 per cent for men and 7.9 per cent for women, though the latter is not quite significant at conventional levels. All these estimates are arrived at after allowing for a large number of other generic skills and other conventional controls, which makes them more robust to the critique that they are overestimates because they might suffer from omitted skill bias. Our IV estimates also show only small differences from the OLS estimates. Nevertheless, it remains possible that our computer use measures are proxying other unobserved real pay-determining factors which would not be affected by computer skills training. The direct and interactive effect of Computer Skills and Influence Skills has risen somewhat over the decade, indicating increased scarcity. It is notable, however, that in earlier years the impact of computing skills on pay was more direct and depended far less or not at all on the use of influence skills. It is only recently that the complementarity has become evident. A possible interpretation one might put upon this late manifestation man·i·fes·ta·tion
An indication of the existence, reality, or presence of something, especially an illness.
(man´ifestā´sh of complementarity is that there is a long and uncertain lag in the process through which managers and others learn how to deploy ICT technologies effectively, and that this learning process occurs at the same time as the technology is developing and new applications are conceived. (13) Whereas, a decade ago, computer skills were valuable generally, in recent years computer skills have become especially productive in jobs where influence skills are also important, and less so in jobs that entail entail, in law, restriction of inheritance to a limited class of descendants for at least several generations. The object of entail is to preserve large estates in land from the disintegration that is caused by equal inheritance by all the heirs and by the ordinary little use of influence skills and where computer applications have become more routine. Whatever the explanation, our findings indicate that the complementarity is only now beginning to emerge after a decade of high investment.
The implied increased scarcity of computing skills, evident in our findings, provides general support for policies to broaden the stock of computing skills in the population; the findings also reinforce the need to ensure adequate supplies of people with what we have termed 'influence skills'.
Showing that computing skills affect pay is a necessary but insufficient foundation for any argument that ICT raises inequality. Our findings do not establish, one way or another, that the rise of ICT has had a notable effect on inequality compared to some hypothetical Hypothetical is an adjective, meaning of or pertaining to a hypothesis. See:
tr. & intr.v. wid·ened, wid·en·ing, wid·ens
To make or become wide or wider.
widen·er n. still further, play an increasing role in accounting for pay dispersion dispersion, in chemistry
dispersion, in chemistry, mixture in which fine particles of one substance are scattered throughout another substance. A dispersion is classed as a suspension, colloid, or solution. in the coming years. (14)
Appendix: Descriptive statistics Table A1. Means of dependent and independent variables in tables 2 and 3 Males Females Log hourly pay 2.39 2.16 Years of education 12.98 12.93 Work experience (yrs) 23.82 23.68 Work experience/100 7.21 7.05 Computing skills 2.09 2.09 Influence skills 2.08 2.00 Proportion (pr) of workers using computers in establishment: 1/4 <= pr <= 3/4 0.25 0.22 pr > 3/4 0.51 0.56 Table A2. Means of dependent and independent variables in table 4 and 5 Males Female 1997 2001 2006 1997 2001 2006 Log hourly pay 1.97 2.18 2.39 1.71 1.93 2.17 computing skills 1.78 2.06 2.18 1.72 1.98 2.14 Influence skills 1.93 2.00 2.10 1.71 1.81 2.02
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(1) Green et al. (2000) show that the sampling methods used in SCELI yielded a near-representative sample for Britain, while the other four surveys were representative by design.
(2) In addition to influence skills, the other skill domains are labelled: literacy, number, physical, technical know-how, planning, client communication, horizontal communication, problem-solving, checking, aesthetic, emotional.
(3) We use title case when we wish to refer specifically to the index, and lower case when we refer to the underlying concept of influence skills.
(4) Influence Skills should be distinguished here from autonomy (which encompasses influence over one's own work). We also include autonomy as a control in the regressions below.
(5) Unfortunately the EU surveys are only of recent vintage and do not provide a historical perspective.
(6) There are especially sharp differences among women according to their status as part-time or full-time workers (Felstead et al., 2007).
(7) Thus, 4 indicates computers are essential and used at an advanced level, while at the other extreme 0 indicates computers are not used at all in the job.
(8) In practice, treating the indices separately did not lead to better-performing earnings functions.
(9) If not in work five years previously, respondents reported about the past four years or, successively, three years.
(10) For direct comparability, the OLS estimates for the identical sample used in the IV estimates were 0.144 (0.010) for males and 0.114 (0.010) for females.
(11) Equivalent to 98 per cent and 96 per cent of the standard deviation for men and for women respectively.
(12) It could be argued that computing skills might also complement other generic skills. We have checked that the pattern of results shown here does not alter when computing skills are interacted with all other generic skills indicators and with autonomy. Moreover, the large majority of these other interactions are statistically insignificant; we prefer to exclude them from the analyses here, rather than just include the few that turn out ad hoc For this purpose. Meaning "to this" in Latin, it refers to dealing with special situations as they occur rather than functions that are repeated on a regular basis. See ad hoc query and ad hoc mode. to be significant.
(13) Changing applications on the internet are documented in Felstead et al. (2007, p. 101).
(14) This paper has been narrowly materialistic ma·te·ri·al·ism
1. Philosophy The theory that physical matter is the only reality and that everything, including thought, feeling, mind, and will, can be explained in terms of matter and physical phenomena.
2. in focussing on the effects of computers on pay. The impact on other variables related to worker well-being, including job autonomy and job satisfaction, are to be the focus of subsequent research.
Francis Green Francis James Green (born April 23 1980 in Derby, England) is a professional footballer who plays for Macclesfield Town. He is 5'09" and weighs 11 stone.
Francis Green began his career at Ilkeston Town, before going to Peterborough United. , * Alan Felstead, ** Duncan Gallie *** and Ying Zhou ***
* Kent University, e-mail: G.F.Green@kent.ac.uk ** Cardiff University Cardiff University (Welsh: Prifysgol Caerdydd) is a leading university located in the Cathays Park area of Cardiff, Wales. It received its Royal charter in 1883 and is a member of the Russell Group of Universities. It has an annual turnover of £315 million. . *** Nuffield College, Oxford University. The 2006 Skills Survey on which this paper is partially based was supported by grants from the Economic and Social Research Council The Economic and Social Research Council (ESRC) is one of the seven Research Councils in the United Kingdom. It is state-funded (via the Department of Trade and Industry's Office of Science and Innovation), and provides funding and support for research and training work in , the Department for Education and Skills The Department for Education and Skills (DfES) was a United Kingdom government department between 2001 and 2007. It was responsible for the education system and children's services in England. On 28 June 2007 the department was split in two by Gordon Brown. ; the Department for Trade and Industry, the Learning and Skills Council, the Sector Skills Development Agency, Scottish Enterprise Scottish Enterprise is the main national economic development agency of Scotland, the other being Highlands and Islands Enterprise (HIE) carries out similar functions of economic development in the Highlands and Islands of Scotland. , Futureskills Wales, Highlands and Islands Enterprise The Scottish Government's economic development agency for the northern and western half of Scotland:
The Highlands and Islands of Scotland has around 19,000 businesses, more than 440,000 individuals with skills and potential of their own - and more than 8,000 voluntary and , East Midlands Development Agency, and the Department for Employment and Learning Department for Employment and Learning is a Government Department in the Northern Ireland Executive. The aim of the Department is to "promote learning and skills, to prepare people for work and to support the economy.". , Northern Ireland. The analysis reported here is our responsibility alone and cannot be attributed to any of these sponsoring organisations or their representatives. Data from other surveys used are all available at the UK Data Archive The UK Data Archive is based at the University of Essex. It is funded by the Economic and Social Research Council, the Joint Information Systems Committee of the Higher Education Funding Councils, and the University of Essex. .
Table 1. Computing and influence skills, 1997-2006 Centrality Level of Influence of computing skills (c) computing (b) (a) All employees 1997 33.1 16.1 1.815 2001 41.1 18.0 1.917 2006 49.3 22.6 2.062 Men 1997 29.9 19.9 1.91 2001 40.0 22.4 2.005 2006 47.6 28.2 2.106 Women 1997 36.7 11.8 1.71 2001 42.4 12.9 1.817 2006 51.1 16.8 2.017 Age 20-40 1997 35.1 17.9 1.786 2001 44.2 21.5 1.942 2006 50.8 26.2 2.055 Age 41-60 1997 30.4 13.6 1.856 2001 37.5 13.8 1.888 2006 47.6 18.7 2.071 Education level No qualifications 1997 13.5 2.5 1.19 2001 15.4 4.6 1.322 2006 20.0 3.8 1.412 NVQ 1 or 1997 22.0 8.5 1.523 equivalent 2001 25.7 4.5 1.501 2006 30.9 10.7 1.546 GCSE grade C 1997 34.8 10.2 1.643 or equivalent 2001 42.1 13.3 1.677 2006 47.4 13.5 1.807 A level or 1997 38.3 19.9 1.879 equivalent 2001 41.4 19.5 1.882 2006 42.9 18.7 1.998 Professional or 1997 37.6 26.7 2.458 vocational 2001 48.7 24.5 2.334 degree 2006 61.6 31.0 2.475 Bachelor's 1997 53.3 38.4 2.585 degree level 2001 60.8 33.7 2.584 or above 2006 70.5 42.4 2.605 Notes: Figures are for employees in England, Wales and Scotland, aged 20-60; excludes those working in private households or extra-territorial organisations. (a) Percentage reporting use of PC or other types of computerised equipment to be 'essential' in their job. (b) Percentage reporting that they use computers at a 'complex' or 'advanced' level. Examples of 'complex' use were: using a computer for analysing information or design, including use of computer aided design or statistical analysis packages; an example of 'advanced' use was using computer syntax and/or formulae for programming. (c) Index derived from six closely correlated items; see text. Table 2. The impact of computing and influence skills on hourly pay of men, 2006 (1) (2) (3) OLS OLS IV Years of 0.061 0.044 0.038 education (0.005)** (0.004)** (0.007)** Work experience (yrs) 0.041 0.037 0.034 (0.003)** (0.003)** (0.006)** Work experience squared/100 -0.068 -0.059 -0.053 (0.007)** (0.006)** (0.010)- Computing skills 0.146 0.187 (0.008)** (0.034)** Influence skills (Computing skills) times (Influence skills) Proportion (pr) of workers using computers in establishment: 1/4 <= pr <= 3/4 pr > 3/4 (Influence skills) times (1/4 <= pr <= 3/4) (Influence skills) times (pr > 3/4) OTHER SKILLS INDICES NO NO NO Observations 2641 2641 1534 R-squared 0.31 0.42 (4) (5) OLS OLS Years of 0.035 0.030 education (0.004)** (0.004)** Work experience (yrs) 0.029 0.029 (0.003)** (0.003)** Work experience squared/100 -0.045 -0.047 (0.006)** (0.006)** Computing skills 0.063 0.026 (0.017)** (0.018) Influence skills 0.011 0.032 (0.021) (0.025) (Computing skills) times 0.018 0.013 (Influence skills) (0.009)* (0.009) Proportion (pr) of workers using computers in establishment: 1/4 <= pr <= 3/4 0.024 0.038 (0.043) (0.042) pr > 3/4 -0.102 -0.096 (0.054)+ (0.051)+ (Influence skills) 0.006 -0.000 times (1/4 <= pr <= 3/4) (0.025) (0.023) (Influence skills) 0.094 0.084 times (pr > 3/4) (0.029)** (0.027)** OTHER SKILLS INDICES NO YES Observations 2641 2641 R-squared 0.47 0.51 Notes: Robust standard errors in parentheses; + significant at 10 per cent; * significant at 5 per cent; ** significant at 1 per cent. Weighted regressions. The dependent variable is log hourly pay. All regressions contain standard controls for workplace size, part-time status, public/private sector, permanent/temporary contract status, whether male or female dominated occupation, industry and region. Column (4) includes also twelve further generic skills indicators including a measure of autonomy computed from the job requirements data (see Felstead et al., 2007). Column (3) is run for those who were in the same job either three, four or five years previously. Instruments used for IV estimates: whether in past 5 years workplace has introduced new computing equipment, whether introduced new communications technology equipment, whether introduced other new equipment; and whether workplace has downsized. Anderson canonical correlation LR statistic to test for underidentification test: 153.172, [chi square](4) (P-value = 0.0000); Cragg-Donald F statistic for weak identification: 39.220; Hansen J test statistic for overidentification of all instruments: 0.310, [chi square] (3) P-value = 0.9581. Table 3. The impact of computing and influence skills on hourly pay of women, 2006 (1) (2) (3) OLS OLS IV Years of education 0.076 0.064 0.071 (0.004) ** (0.004) ** (0.006) ** Work experience (yrs) 0.029 0.027 0.028 (0.003) ** (0.003) ** (0.004) ** Work experience squared /100 -0.046 -0.043 -0.044 (0.005) ** (0.005) ** (0.007) ** Computing skills 0.109 0.098 (0.008) ** (0.035) ** Influence skills (Computing skills) times (Influence skills) Proportion (pr) of workers using computers in establishment: 1/4 <= pr <= 3/4 pr > 3/4 (Influence skills) times (1/4 <= pr <= 3/4) (Influence skills) times (pr > 3/4) OTHER SKILLS INDICES NO NO NO Observations 2852 2852 1652 R-squared 0.41 0.47 (4) (5) OLS OLS Years of education 0.048 0.043 (0.004) ** (0.004) ** Work experience (yrs) 0.020 0.020 (0.002) ** (0.002) ** Work experience squared /100 -0.029 -0.03 (0.005) ** (0.005) ** Computing skills 0.032 0.018 (0.014) * (0.015) Influence skills 0.018 0.040 (0.018) (0.023) + (Computing skills) times 0.021 0.021 (Influence skills) (0.008) * (0.008) * Proportion (pr) of workers using computers in establishment: 1/4 <= pr <= 3/4 -0.006 0.003 (0.041) (0.040) pr > 3/4 0.009 0.010 -0.042 -0.042 (Influence skills) 0.021 0.018 times (1/4 <= pr <= 3/4) (0.023) (0.023) (Influence skills) 0.041 0.038 times (pr > 3/4) (0.024) + (0.023) OTHER SKILLS INDICES NO YES Observations 2852 2852 R-squared 0.54 0.56 Notes: See table 1. For column (3) Anderson canonical correlation LR statistic to test for underidentification test: 141.106, [chi square] (4) (P-value 0.0000); Cragg-Donald F statistic for weak identification: 35.935; Hansen J test statistic for overidentification of all instruments: 2.004, [chi square] (3) P-value = 0.5716. Table 4. Returns to computing and influence skills over time for men 1997 2001 2006 Computing skills 0.077 0.038 0.021 (0.022) ** (0.017) * -0.015 Influence skills 0.129 0.121 0.077 (0.030) ** (0.027) ** (0.022) ** (Computing skills) times (influence skills) -0.013 0.013 0.025 -0.010 -0.009 (0.007) ** Observations 978 1811 2525 R-squared 0.49 0.45 0.49 Notes: Robust standard errors in parentheses; + significant at 10 per cent; * significant at 5 per cent; ** significant at 1 per cent. Weighted regressions; all years refer to population of GB aged 20-60. The dependent variable is log hourly pay. All regressions include schooling and a quadratic in work experience and contain standard controls for workplace size, part-time status, public/private sector, permanent/temporary contract status, whether male or female dominated occupation, industry, region and ten further generic skills indicators including a measure of autonomy computed from the job requirements data (see Felstead et al., 2007). Table 5. Returns to computing and influence skills over time for women 1997 2001 2006 Computing skills 0.050 0.053 0.027 (0.017)** (0.015)** (0.014)+ Influence skills 0.125 0.119 0.085 (0.025)** (0.021)** (0.022)** (Computing skills) times (influence skills) -0.003 0.003 0.026 (0.008) (0.007) (0.007)** Observations 967 1816 2770 R-squared 0.60 0.50 0.53 Notes: See table 4.