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


From   David Kantor <kantor.d@att.net>
To   statalist@hsphsun2.harvard.edu
Subject   Re: st: Propensity Score Matching with Multiple Categorical Variables with Multiple Categories...Dummy Variables?
Date   Fri, 13 Jul 2012 08:16:31 -0400

At 11:06 PM 7/12/2012, TA Stat (Pete) wrote:
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?

I believe that is the correct way to do it.
An alternative is that for some selected variables, require an exact match. But that only works if you have other variables that are either...
 quantitative, or
 categorical, but transformed into a set of dummy variables

HTH
--David

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