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st: sampsize formula
From
Sara Borelli <[email protected]>
To
"[email protected]" <[email protected]>
Subject
st: sampsize formula
Date
Thu, 3 Nov 2011 15:11:59 -0400
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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