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| 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 * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/statalist/faq * http://www.ats.ucla.edu/stat/stata/