Hi Holger,
Yes, I didn't know that--and would agree, you'd rather get the closest
match, especially with a flexible caliper. I guess the lesson is to keep
the caliper as small as possible, and to only turn to calipers as a last
resort?
Best,
Dan
On Wed, 26 Apr 2006, Holger Lutz Kern wrote:
Hi Dan and Ian,
one general question about matchit. The manual states that
"If a caliper is specified, a control unit within the
caliper for a treated unit is randomly selected as the match
for that treated unit." This seems weird. Wouldn't we like
to choose the closest unit within the caliper, or otherwise
drop the unit because we cannot find a good match? Randomly
choosing a unit as match within the caliper does not seem
like a very efficient strategy...
Holger
--
Holger Lutz Kern
Graduate Student
Department of Government
Cornell University
Institute for Quantitative Social Science
Harvard University
1737 Cambridge Street N350
Cambridge, MA 02138
www.people.cornell.edu/pages/hlk23
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