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From |
Steve Samuels <sjsamuels@gmail.com> |

To |
statalist@hsphsun2.harvard.edu |

Subject |
Re: st: RE: How to calculate standardized difference in means with survey weighted data? |

Date |
Thu, 29 Mar 2012 00:32:45 -0400 |

Correction. Lok Wong asked how to do this on March 4 and Shaun Scholes gave an incomplete solution on March 5. I supplied an answer, but unfortunately it was wrong. I made an elementary mistake: I supposed that a pooled SD is the same as the SD of the pooled data. Here's a solution that creates and pools the separate SDs. My apologies to all. Steve sjsamuels@gmail.com *************CODE BEGINS************* sysuse auto, clear svyset _n [pw = turn] // set up variable list local vlist length weight foreach v of varlist `vlist'{ qui svy: mean `v', over(foreign) qui estat sd local m1 = el(r(mean),1,1) local m2 = el(r(mean),1,2) local s1 = el(r(sd),1,1) local s2 = el(r(sd),1,2) local n1 = el(e(_N_subp),1,1) local n2 = el(e(_N_subp),1,2) local sdpool = /// Pooled SD sqrt((`n1'*(`s1')^2+`n2'*(`s2')^2) /(`n1'+`n2')) local sdiff = (`m1'-`m2')/`sdpool' di as result /// _column(3) `"Standardized Difference for `v': "' /// _column(38) " = " _column(42) `sdiff' } ******************************************* * * 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: How to calculate standardized difference in means with survey weighted data?***From:*Lok Wong <lokwongedu@gmail.com>

**st: RE: How to calculate standardized difference in means with survey weighted data?***From:*"Scholes, Shaun" <s.scholes@ucl.ac.uk>

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