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Paul T Seed, Senior Lecturer in Medical Statistics,
Division of Women's Health, King's College London
Women's Health Academic Centre, King's Health Partners
(+44) (0) 20 7188 3642.
> Date: Tue, 1 Apr 2014 11:57:12 +0000
> From: "Pesola, Francesca" <firstname.lastname@example.org>
> Subject: st: sampsi for repeated measure t test
> 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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