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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 15:43:55 -0400

note that the manuals are available as pdf's also and you should be able
to get there via stata; start with -h sampsi- and click on the reference
to the manual "[R]" in blue at the top of the page

On 11/3/11 3:40 PM, Sara Borelli wrote:
> Thanks for the reference!
> Sara
> 
> Sara Borelli, Ph.D.
> Research Associate
> 
> 
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> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Richard Goldstein
> Sent: Thursday, November 03, 2011 3:34 PM
> To: statalist@hsphsun2.harvard.edu
> 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)
> 
> 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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