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st: Sample size to detect a rare response


From   Paddy Woodburn <paddywoodburn@yahoo.co.uk>
To   statalist@hsphsun2.harvard.edu
Subject   st: Sample size to detect a rare response
Date   Mon, 30 Nov 2009 07:57:13 -0800 (PST)

Dear Statalist,

If you wanted 90% power to detect at least one positive result for a rare condition (expected proportion P) in a population, how would you calculate how many people you would need to test?  Is there a command for this?

Best regards,

Paddy


      

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