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st: sample size


From   "Janssen, Nathalie (Stud. FPN / Alumni)" <NJJF.Janssen@student.maastrichtuniversity.nl>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: sample size
Date   Tue, 5 Jul 2011 14:15:51 +0200

Dear statalist, 

I am investigating the effect of the exposure to certain events in three groups of people 
independent variable =  event exposure(continuum)
dependent variable = psych symptoms (continuum)
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. 
How can I calculate this? 

Regards,
Nathalie 
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