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st: sampsize formula


From   Sara Borelli <sborelli@impaqint.com>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
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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