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st: RE: Propensity Score Matching with Multiple Categorical Variables with Multiple Categories...Dummy Variables?


From   E Michael Foster <emfoster@uab.edu>
To   "statalist@hsphsun2.harvard.edu" <statalist@hsphsun2.harvard.edu>
Subject   st: RE: Propensity Score Matching with Multiple Categorical Variables with Multiple Categories...Dummy Variables?
Date   Fri, 13 Jul 2012 13:59:02 +0000

Myself, I think matching is such a pandora's box with two categories

Just use iptw and you'll thank me for it -- 

-----Original Message-----
From: owner-statalist@hsphsun2.harvard.edu [mailto:owner-statalist@hsphsun2.harvard.edu] On Behalf Of TA Stat
Sent: Thursday, July 12, 2012 10:06 PM
To: statalist@hsphsun2.harvard.edu
Subject: st: Propensity Score Matching with Multiple Categorical Variables with Multiple Categories...Dummy Variables?

Dear All

In PS matching, I am wondering about how to handle multiple categorical variables e.g. 15 variables.  Each variable has multiple categories e.g. 3-5 categories.  Do I have to create dummy variables,
(n-1 for each variable), for all those categorical variables before calculating propensity score?

Thanks
Pete
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