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st: RE: sampsize formula
From
"Sarah Edgington" <[email protected]>
To
<[email protected]>
Subject
st: RE: sampsize formula
Date
Thu, 3 Nov 2011 12:36:16 -0700
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: [email protected]
[mailto:[email protected]] On Behalf Of Sara Borelli
Sent: Thursday, November 03, 2011 12:12 PM
To: [email protected]
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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