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From | Christian Miranda Pacheco <Christian.Miranda@univ-paris1.fr> |
To | statalist@hsphsun2.harvard.edu |
Subject | st: Statistical Matching with psmatch2 ? |
Date | Thu, 30 May 2013 19:48:15 +0200 |
Hi everybody,I try to match two different datasets A(contaning variables a)and B (containing variables b). using propensity score. They have common demographic covariates c(age, sex..) and i would like to use them to get a unique dataset, from this form
id (c) (a) (b) 1A c a . 2A c a . 3A c a . 4B c . b 5B c . b 6B c . bTo the merged dataset (a') I try to get _b being the estimated variables taken from (b) , T being the tratment status
id T (c) (a) (b) (a') 1A 0 c a . a 2A 0 c a . a 3A 0 c a . a 4B 1 c . b _b 5B 1 c . b _b 6B 1 c . b _b I'am actually using .pscore and .psmatch2 First i get a balanced pscore from, .pscore T c ,pscore(PSCORE) Then I include it in the following precedure .psmatch2 T, outcome(_b) pscore(PSCORE) The outcome is disapointing, I get _b that are all zero or missing.I presume it could be that i have a lot of missing values amid the b variables, or maybe my specification is just wrong.
Do you have any experience on this? Thanks! Christian -- Ce message a ete verifie par MailScanner pour des virus ou des polluriels et rien de suspect n'a ete trouve. * * For searches and help try: * http://www.stata.com/help.cgi?search * http://www.stata.com/support/faqs/resources/statalist-faq/ * http://www.ats.ucla.edu/stat/stata/