st: power calculation in a case control design

["stata_user stata_user" <stata_dofile@hotmail.co.uk>]

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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