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re: st: PSMATCH with 2 conditions
From
"Caskey, Judson" <[email protected]>
To
"[email protected]" <[email protected]>
Subject
re: st: PSMATCH with 2 conditions
Date
Tue, 7 Sep 2010 11:07:37 -0700
See the following post for an example of forcing a match:
http://www.stata.com/statalist/archive/2010-09/msg00073.html
In your case, say you have a 4-digit industry code (e.g. SIC). You can first compute propensity scores, then make a new variable pscore2 that looks like:
pscore2 = year*100000+industry*10+pscore
If you have year 1999, industry 1234 and p-score 0.25, you get:
pscore2 = 199912340.25
If you put a caliper of, say, 0.5, it is impossible to match to a firm in a different industry/year.
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