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From |
"Ariel Linden. DrPH" <ariel.linden@gmail.com> |

To |
<statalist@hsphsun2.harvard.edu> |

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

Date |
Mon, 5 Mar 2012 11:47:53 -1000 |

Since my posting, Steve Samuels brought up the point that -pbalchk- (-findit-) does not weight the sd as well as the means. Mattieu Schonlau has a program that does balance checking that accounts for survey weights and strata. I believe the progoram weights the sd appropriately, but that needs to be verified. net describe psbalance, from(http://www.schonlau.net/stata) Ariel '********************************************************* You can use either -pstest- or -pbalchk- (both are user written programs -findit-). Since they both allow for weights anyways, I assume you could use your survey weight either in place of the existing weight needed to account for multiple controls, or if need be, multiple the two weights together. Ariel Date: Sun, 4 Mar 2012 19:45:43 -0500 From: Lok Wong <lokwongedu@gmail.com> Subject: st: How to calculate standardized difference in means with survey weighted data? I need to calculate the standardized bias (the difference in means divided by the pooled standard deviation) with survey weighted data using STATA. I am comparing the means of 2 groups (Y: treatment and control) for a list of X predictor variables. The purpose is to evaluate differences before and after propensity score weighting (not matching so I cannot use PSMATCH2 or other similar packages). This is as far I got: svy: mean X, over (Y) estat sd lincom [X]1 - lincom [x]0 I calculated the means by treatment/control groups. Then obtained the standard deviations for each means (as the SE is reported by svy: means) I used lincom to obtain the difference in means from the svy post-estimation results. How do I now extract the stored standard deviations for the 2 means, so I can divide the difference in means by the pooled standard deviation? I need to do this twice for 20 variables, so I don't want to just read the output results and calculate by hand. Any suggestions? I did see an earlier posting (from 2005) on Standardized Response Mean, but the suggested code (diff in change score / sd of change score) does not address how to use survey weighted data. Thanks! Lok Wong Samson Doctoral Candidate JHSPH lokwongedu@gmail.com * * 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/

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