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st: Sample size calculation with uneven sample sizes


From   Matthew Bombyk <mbombyk@poverty-action.org>
To   statalist@hsphsun2.harvard.edu
Subject   st: Sample size calculation with uneven sample sizes
Date   Wed, 23 Jan 2013 17:25:24 +0800

Dear Statalist,

I have a question about power calculations. I currently have a
baseline survey dataset, and we are planning the followup. I would
like to do sample size calculations using various
assumptions/requirements, and on several variables. However, the
-sampsi- command in Stata only allows for power calculations with
uneven sample sizes, not sample size calculations, unless you have a
fixed ratio. Other programs such as Optimal Design appear to have this
feature, but it is unwieldy to perform many power calculations using
different variables and parameters. Does anyone have a solution to
this problem in Stata?

Thanks,

--
Matthew Bombyk

Project Coordinator
Innovations for Poverty Action (IPA)
Ulaanbaatar, Mongolia
Tel: +976 9990 1542

www.poverty-action.org
Fighting poverty with innovation, evidence, and action
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