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st: detectable alternative/effect size;

From   Elliott Dasenbrook <>
Subject   st: detectable alternative/effect size;
Date   Tue, 16 Sep 2008 16:18:57 -0400


I am trying to calculate the detectable alternative for a dichotomous outcome expressed as a relative risk given my sample size and a power of 0.90; 
Is there a command/package in STATA that does this? [i saw that this can be calculated for Cox proportions]
The sampsi command only allows calculation of power or sample size as far as I can tell; 

Thank you,

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