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RE: st: sampsize formula

From   Sara Borelli <>
To   "" <>
Subject   RE: st: sampsize formula
Date   Thu, 3 Nov 2011 15:40:29 -0400

Thanks for the reference!

Sara Borelli, Ph.D.
Research Associate

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-----Original Message-----
From: [] On Behalf Of Richard Goldstein
Sent: Thursday, November 03, 2011 3:34 PM
Subject: Re: st: sampsize formula

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


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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