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Matching to Remove Bias in Observational Studies

Donald B. Rubin
Biometrics
Vol. 29, No. 1 (Mar., 1973), pp. 159-183
DOI: 10.2307/2529684
Stable URL: http://www.jstor.org/stable/2529684
Page Count: 25
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Matching to Remove Bias in Observational Studies
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Abstract

Several matching methods that match all of one sample from another larger sample on a continuous matching variable are compared with respect to their ability to remove the bias of the matching variable. One method is a simple mean-matching method and three are nearest available pair-matching methods. The methods' abilities to remove bias are also compared with the theoretical maximum given fixed distributions and fixed sample sizes. A summary of advice to an investigator is included.

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