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st: power calculation and sample size


From   "stata_user stata_user" <[email protected]>
To   [email protected]
Subject   st: power calculation and sample size
Date   Fri, 06 Apr 2007 21:01:35 +0100

Dear All,

I would be highly thankful to you if you let me know the way in which sample size can be calculated for the following problem

I am studying the occurrence of a disease between two groups.
I have an annual average event rate of 1.6 % and a follow up period of 5 years, I want to have a power of 80% with alpha 5% I am looking to detect a relative risk of 3.0 associated with group1 versus group 2 .

I am trying to find the best way to do this in stata,


Thank you very much ,

Regards,

Sami

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