Compute the standardized mean distance between 2 groups for numerical or categorical information. Using method described in 'A unifed approach to measuring the effect size between two groups using SAS' by Dongsheng Yand and Jarrod E. Dalton, 2012. SAS Global Forum 2012
standard_difference(x, group, weight = NULL)
vector; data to estimate effect size for groups
vector; the grouping variable.
vector; weighting information for x