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Re: st: sampsize formula


From   Richard Goldstein <richgold@ix.netcom.com>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: sampsize formula
Date   Thu, 03 Nov 2011 15:34:20 -0400

the formulae are given in the manual in the "methods and formulas"
section -- starts on p. 1923 of the reference manual (v. 12)

Rich

On 11/3/11 3:11 PM, Sara Borelli wrote:
>   
> Hello Statalist members,
>  
> I would like to know the exact formula beyond the sampsi command to calculate the sample size of two groups using comparison of means :
>  
> sampsi     m1  m2,  sd1()  sd2()  power ()  alpha() 
>  
> the output gives me the sample size of the two groups, n1 and n2, but I would need the exact mathematical formula
>  
> Thanks for any suggestion
> Sara Borelli
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