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Re: st: sample size


From   Maarten Buis <maartenlbuis@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: sample size
Date   Tue, 5 Jul 2011 14:32:52 +0200

On Tue, Jul 5, 2011 at 2:15 PM, Janssen, Nathalie wrote:
> Now, the main analysis is a regression concerning the group x event exposure interaction effect. I want to know how large my sample size needs to be for an effect size of around .4 and a power of .8.

Type in Stata -findit power sample size- and you'll see lots of options.

-- Maarten

--------------------------
Maarten L. Buis
Institut fuer Soziologie
Universitaet Tuebingen
Wilhelmstrasse 36
72074 Tuebingen
Germany


http://www.maartenbuis.nl
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