From: "Visintainer, Paul" <PAUL_VISINTAINER@NYMC.EDU>
Reply-To: statalist@hsphsun2.harvard.edu
To: <statalist@hsphsun2.harvard.edu>
Subject: st: RE: power calculation in a case control design
Date: Tue, 30 Jan 2007 11:06:45 -0500
What's the (assumed) prevalence of exposure in your control group?
______________________________________
Paul F. Visintainer, PhD
Professor and Chair
Department of Epidemiology and Biostatistics
School of Public Health
New York Medical College
PH: (914) 594-4804
FX: (914) 594-4853
-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu
[mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of stata_user
stata_user
Sent: Friday, January 26, 2007 4:58 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: power calculation in a case control design
Dear All,
I have a case control design with 83 cases and 139 controls.
I am intersted in the power of two sided 5% (or 1 sided) test to
detect
an approximate relative risk of less than 4.
Is there any possibility to have a solution using stata?
Thanks a lot
Sami
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