Hi Geoff,
You can do this by using "exact restrictions". See the section
"Additional Arguments for Nearest Neighbor Matching" for the details.
More generally, you can also use caliper or cem. All of these options are
in the manual too.
Kosuke
---------------------------------------------------------
Kosuke Imai Office: Corwin Hall 041
Assistant Professor Phone: 609-258-6601
Department of Politics eFax: 973-556-1929
Princeton University Email: kimai(a)Princeton.Edu
Princeton, NJ 08544-1012 http://imai.princeton.edu/
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On Tue, 13 Jan 2009, Geoffrey Smith wrote:
> Hello Prof. Imai,
>
> Thank you for the MatchIt package. It is useful and easy to understand. May I ask a quick question?
>
> What if some control variables I want to match "exact" and others only "nearest?" For example, say I want to match exactly on "location" (i.e., same State) and only "nearest" on say "height." Is there a way to do this with MatchIt? Thank you very much.
>
> Geoff
>
> Geoffrey Smith
> Visiting Assistant Professor
> Department of Finance
> University of Illinois at Urbana-Champaign
>
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