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st: question on calculating power from incidence rates


From   Maren Weischer <MARWEI01@glo.regionh.dk>
To   statalist@hsphsun2.harvard.edu
Subject   st: question on calculating power from incidence rates
Date   Thu, 17 Apr 2008 14:34:37 +0200

Dear Statalisters

 

I have a question on calculating power from incidence rates per 100.000
person years. 

Is it possible? I only have this information for two groups: incidence
rates of breast cancer of 27.2 and 25.5 / 100.000 years and a p value
from a fishers exact test p=.84.

I want to determine the relative risk of breast cancer that I have 80%
power to detect?

 

Kind regards

 

Maren Weischer,

Dept of Clinical Biochemistry, 

Herlev University Hospital.

Denmark


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