Hello,   I was running the following core syntax Proc  data=XXX;   class GROUP; strata STRT; var OUTCOME; run; For a stratified MWM test (2 groups, 2 strata). I got the output below: Output My question: We see that the (uncorrected) test-statistic Z is: (46.3 – 42.5) / 1.907524 =  1.992111 While the output Z statistic is: 2.0001 Why is the difference? (approximation/ correction? Couldn’t find any reference and would appreciate having one). Thanks Liran ... View more