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RE: st: RE: power calculation in a case control design


From   "stata_user stata_user" <[email protected]>
To   [email protected]
Subject   RE: st: RE: power calculation in a case control design
Date   Tue, 30 Jan 2007 21:41:14 +0000

Thanks a lot for all the suggestions and help.

I could not answer the emails earlier, sorry about that.

The prevalence of exposure in the control group is

19 or 13%

It is a difficult situation compared to the situation where we have to test equal means or equal proportions

I will appreciate any further suggestions

Sami



From: "Visintainer, Paul" <[email protected]>
Reply-To: [email protected]
To: <[email protected]>
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: [email protected]
[mailto:[email protected]] On Behalf Of stata_user
stata_user
Sent: Friday, January 26, 2007 4:58 PM
To: [email protected]
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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