Overlapping area represents the amount of risk that can be diversified away by holding Computer Task Group Incorporat and Genpact Limited in the same portfolio assuming nothing else is changed. The correlation between historical prices or returns on Genpact Limited and Computer Task is a relative statistical measure of the degree to which these equity instruments tend to move together. The correlation coefficient measures the extent to which returns on Computer Task Group Incorporated are associated (or correlated) with Genpact. Values of the correlation coefficient range from -1 to +1, where. The correlation of zero (0) is possible when the price movement of Genpact Limited has no effect on the direction of Computer Task i.e. Computer Task and Genpact go up and down completely randomly.