Sure, you can do that. However you define the strata, at the end of the day
you just define the weights based on the number of treated and controls in
each, and you will be ok.
---
Gary King
GKing.Harvard.edu
617-500-7570
On Apr 29, 2015 10:14 AM, "pureum kim" <pureum.kim(a)usc.edu> wrote:
Dear CEM List members,
I have about 45 treatment firms and I am trying to create a control
sample. Using that control
sample, we plan to collect additional information about the firm, which
would take some time and
effort. I was wondering if I could use different CEM specifications for
each treatment firm to get the
most accurate control firms.
The issue is that for some treatment firms, I get a huge strata, on the
other
hand, for other groups I have two control firms. I was wondering if I
could use a more stringent
matching criteria for those treatment firms with large number of control
firms and a less stringent
matching criteria for those that have a low number of control firms.
My concern is how would I run a regression later because the weights are
derived from different
matching specifications. Or does it matter?
Thank you for your time and consideration.
Kind Regards,
Pureum Kim
-
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