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st: sampsi for repeated measure t test

From   "Pesola, Francesca" <[email protected]>
To   "[email protected]" <[email protected]>
Subject   st: sampsi for repeated measure t test
Date   Tue, 1 Apr 2014 11:57:12 +0000

Dear Listers,

I need to run a post-hoc sample size calculation for a repeated measure t-test to compare baseline and follow-up scores. My data was collected across 6 teams which I am treating like clusters (with ICC = .017) and the n1:n2 = 75. 

Can I calculate the sample size using:

sampsi 3   3.67,  sd1(0.79) sd2(0.75) p(0.9) r(.75)
sampclus, rho(0.017) numclus(6)

where 3 and 3.67 are my actual means at baseline and follow-up and  sd1 and sd2 are the actual sd at baseline and follow-up. 

Is this OK?


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