Dear Frankgreen, Thank you for your reply. I almost agree with you, but I don't think that the graph is exact because it is an approximate value. Please submit the example code below. Comparing results, you can see that the estimated value on the graph can be affected by the number of values for the parameter, that is, the precision can differ depending on the option. /*example1*/ proc power; pairedmeans test=equiv_ratio dist=lognormal meanratio = 1.10 alpha = 0.05 cv = 0.15 corr = 0 lower = 0.8 upper = 1.25 npairs = 2 to 100 by 1 power =. ; plot min=2 max=100 yopts=(ref=0.8, 0.9 crossref=yes) ; run; /*example2*/ proc power; pairedmeans test=equiv_ratio dist=lognormal meanratio = 1.10 alpha = 0.05 cv = 0.15 corr = 0 lower = 0.8 upper = 1.25 npairs = 2 to 100 by 1 power =. ; plot min=2 max=100 yopts=(ref=0.8, 0.9 crossref=yes) npts=500; run; regard, yasu
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