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Re: st: sampsize formula
From
Richard Goldstein <[email protected]>
To
[email protected]
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: [email protected] [mailto:[email protected]] On Behalf Of Richard Goldstein
> Sent: Thursday, November 03, 2011 3:34 PM
> To: [email protected]
> 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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