Here's the problem, perhaps in better detail. This study already had a sample size calculated in the study design, from another program, before the data was ever collected. Now I need to do a Wilcoxon signed rank test for 40 subjects, with alpha 0.05 and b (power) 0.85, which are the assumptions from the sample size document. So far what I have figured out is that I can use PROC UNIVARIATE, and ALPHA =, but I can't find how to redefine beta. Everything that I have read which discusses "power" is about sample size and power calculations, not about simply assigning new value for beta.
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