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
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.
Department of Epidemiology
Rollins School of Public Health
Atlanta, GA 30322