[R] Propensity Score Matching with Restrictions (Matching package)

[Bannert Matthias]

Dear listers,

I am using Jas Sekhon's Matching package to perform propensity score matching and like it a lot so far.
Still though I wonder whether it is possible to impose restrictions on the Matching. I've seen the restriction parameter, but I doubt this is what I want (or I don't get how to use it more neatly).

Here's what I  do:
I used a pool several years of observations into one dataset and estimate a propensity score
using a standard glm / probit approach. I then use the fitted values as propensity scores and perform the
matching.

Here's what I would like to do (in addition):
restrict the matching in way that only allows for matches within the same year, so that only propensity scores within the same year are considered for a respective match. Note that I don't what to estimate the years separately.

Is there a way to do so?

best regards

matthias

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Matthias Bannert
KOF Swiss Economic Institute
Leonhardstrasse 21
8045 Zürich
Switzerland