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


From   TA Stat <tastat@gmail.com>
To   statalist@hsphsun2.harvard.edu
Subject   st: Propensity Score Matching with Multiple Categorical Variables with Multiple Categories...Dummy Variables?
Date   Fri, 13 Jul 2012 10:06:14 +0700

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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