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Propensity Score Matching Methods For Non-Experimental Causal Studies (2002)
| Citations: | 684 - 3 self |
BibTeX
@MISC{Dehejia02propensityscore,
author = {Rajeev H. Dehejia and Sadek Wahba},
title = { Propensity Score Matching Methods For Non-Experimental Causal Studies},
year = {2002}
}
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Abstract
This paper considers causal inference and sample selection bias in non-experimental settings in which: (i) few units in the non-experimental comparison group are comparable to the treatment units; and (ii) selecting a subset of comparison units similar to the treatment units is difficult because units must be compared across a high-dimensional set of pretreatment characteristics. We discuss the use of propensity score matching methods, and implement them using data from the NSW experiment. Following Lalonde (1986), we pair the experimental treated units with non-experimental comparison units from the CPS and PSID, and compare the estimates of the treatment effect obtained using our methods to the benchmark results from the experiment. For both comparison groups, we show that the methods succeed in focusing attention on the small subset of the comparison units comparable to the treated units and, hence, in alleviating the bias due to systematic differences between the treated and comparison units.
Keyphrases
propensity score matching method non-experimental causal study comparison unit treatment unit nsw experiment benchmark result pretreatment characteristic systematic difference treatment effect causal inference sample selection bias non-experimental setting propensity score non-experimental comparison group high-dimensional set non-experimental comparison unit small subset comparison group
