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st: Re: sampclus formula


From   cristian larroulet <clarroulet@povertyactionlab.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: Re: sampclus formula
Date   Tue, 17 Jan 2012 15:51:06 -0300

Hi,
Here at J-PAL Latin America we are working on some power calculations
that mix the presence of baseline measurements and clustered design.
We are having problems fitting calcs done by excel with what Stata
says (and Optimal design as well). This only happens when we use the
options of clustering (usign sampclus) and "correlation between
baseline and follow-up". The basic cases (only clustering or only
using baseline) work well. It seem to us that Stata is doing an
aditional correction when both options are active. Does anyone here
knows the exact formula that stata has for sampsi-sampclus?
thanks

-- 
Cristián.

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