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Re: st: RE: RE: sampsize formula


From   William Buchanan <william@williambuchanan.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: RE: RE: sampsize formula
Date   Thu, 3 Nov 2011 12:42:36 -0700

Hi Sara,

You should have access to the manuals via Stata.  After - help sampsize - you should be able to open the .pdf file of that entry from your computer.  It's possible that someone may have deleted them, but you should be able to get to things that way as well.

- Billy

On Nov 3, 2011, at 12:40 PM, Sara Borelli wrote:

> Thank you Sarah
> The problem is that we do not have access to the manuals right now, but the reference helps a lot
> thanks
> 
> 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 Sarah Edgington
> Sent: Thursday, November 03, 2011 3:36 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: RE: sampsize formula
> 
> 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.
> Hope that helps.
> -Sarah
> 
> -----Original Message-----
> From: owner-statalist@hsphsun2.harvard.edu
> [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of Sara Borelli
> Sent: Thursday, November 03, 2011 12:12 PM
> To: statalist@hsphsun2.harvard.edu
> Subject: st: sampsize formula
> 
>   
> 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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