*********************************************************************** * This is a program that illustrates the use of PROC POWER to * * calculate sample size when comparing two normal means in an * * equivalence trial. * ***********************************************************************; proc power; twosamplemeans dist=normal groupweights=(1 1) alpha=0.05 power=0.9 stddev=0.75 lower=-0.10 upper=0.10 meandiff=0.05 test=equiv_diff ntotal=.; plot min=0.1 max=0.9; title "Sample Size Calculation for Comparing Two Normal Means (1:1 Allocation)in an Equivalence Trial"; run;