Bookmark and Share

Notice: On April 23, 2014, Statalist moved from an email list to a forum, based at

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

st: sample size

From   "Janssen, Nathalie (Stud. FPN / Alumni)" <>
To   "" <>
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? 

*   For searches and help try:

© Copyright 1996–2018 StataCorp LLC   |   Terms of use   |   Privacy   |   Contact us   |   Site index