The new D option provides the one-sided D + and D ˆ’ statistics for the asymptotic two-sample Kolmogorov-Smirnov test, in addition to the two-sided D statistic given by the EDF option. The KS option in the EXACT statement gives exact tests for the Kolmogorov-Smirnov D +, D ˆ’ , and D for two-sample problems.