Date:         Mon, 8 May 2006 12:43:25 -0400
Reply-To:     Kevin Roland Viel <kviel@EMORY.EDU>
Sender:       "SAS(r) Discussion" <SAS-L@LISTSERV.UGA.EDU>
From:         Kevin Roland Viel <kviel@EMORY.EDU>
Subject:      Re: help on power calculation
In-Reply-To:  <200605081616.k48AkSmZ026573@malibu.cc.uga.edu>
Content-Type: TEXT/PLAIN; charset=US-ASCII

On Mon, 8 May 2006, Wrong Wang wrote:

> Hi, all
>
> I am asked to do power calculation for a case-control study, the sample
> sizes are equal in the two groups. I will compare the upper quartile group
> to the lower quartile group.
>
> I know I can use proc power in SAS to calculate power for a normal case-
> control study, which given prevalence of exposure in control group. But in
> the above condition, I don't think it's correct to just set prevalence of
> exposure in control group as 0.25.
>
> So I need your help on how to solve such problem.

http://listserv.uga.edu/cgi-bin/wa?A2=ind0501D&L=sas-l&P=R19766
http://listserv.uga.edu/cgi-bin/wa?A2=ind0408B&L=sas-l&D=0&m=145067&P=52243

For starters....

Good luck,

Kevin

Kevin Viel
Department of Epidemiology
Rollins School of Public Health
Emory University
Atlanta, GA 30322