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Re: st: RE: RE: sampsize formula
From
Nick Cox <[email protected]>
To
[email protected]
Subject
Re: st: RE: RE: sampsize formula
Date
Thu, 3 Nov 2011 19:50:48 +0000
This is part of the .pdf documentation in Stata 11 and 12.
Nick
On Thu, Nov 3, 2011 at 7:40 PM, Sara Borelli <[email protected]> wrote:
> Thank you Sarah
> The problem is that we do not have access to the manuals right now, but the reference helps a lot
Sarah Edgington
> Do you have access to the Stata base reference manuals?
> Typically the manuals contain detailed information on the formulas used to
> implement a command. The manual entry for -sampsi- is no exception. It's in
> the section titled "Methods and formulas" near the end of the entry.
Sara Borelli
> 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
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