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From |
Nick Cox <njcoxstata@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: RE: sampsize formula |

Date |
Thu, 3 Nov 2011 19:50:48 +0000 |

This is part of the .pdf documentation in Stata 11 and 12. Nick On Thu, Nov 3, 2011 at 7:40 PM, Sara Borelli <sborelli@impaqint.com> wrote: > Thank you Sarah > The problem is that we do not have access to the manuals right now, but the reference helps a lot Sarah Edgington > 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. Sara Borelli > 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 * * 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/

**References**:**st: sampsize formula***From:*Sara Borelli <sborelli@impaqint.com>

**st: RE: sampsize formula***From:*"Sarah Edgington" <sedging@ucla.edu>

**st: RE: RE: sampsize formula***From:*Sara Borelli <sborelli@impaqint.com>

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