Draw Bias Index.
Draw Bias Index The purpose of the Draw Bias Index (DBI) is to highlight any bias in a particular race with at least nine runners.
Each race is split into three sections those drawn HIGH, MIDDLE or LOW. Every runner in the race is allocated points according to their finishing positions which is converted into a rating between 0 and 100. The lower the number the bigger the disadvantage to those horses drawn in that section, the higher the number the bigger the advantage. If each of the three sections warrants a figure of 50 then this would indicate there was no bias for that race.
The SP percentage for each section is also shown. The bigger the percentage the shorter the combined price of the runners in that section.
For example a HIGH DPI is less of an indicator of a bias if the SP% is also HIGH but a HIGH DPI with a LOW SP% would imply a notable bias.