coefficient of variation

It is defined as the ratio of the standard deviation to the mean. It is a normalized measure of dispersion and it is used to compare the dispersion of populations.

Example: If the mean of set A is 10 and S_A = 3, and the mean of the set B is 15 and S_B = 4, the set A has more relative dispersion than B because CV_A= 0,3 and CV_B= 0,27.