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CEM: Coarsened Exact Matching in Stata

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Author Info

  • Matthew Blackwell

    ()
    (Harvard University)

  • Stefano Iacus

    (Universita degli Studi di Milano, Italy)

  • Gary King

    (Harvard University)

  • Giuseppe Porro

    (Universita degli Studi di Trieste, Italy)

Abstract

We introduce a Stata implementation of coarsened exact matching, a new method for improving the estimation of causal effects by reducing imbalance in covariates between treated and control groups. Coarsened exact matching is faster, is easier to use and understand, requires fewer assumptions, is more easily automated, and possesses more attractive statistical properties for many applications than do existing matching methods. In coarsened exact matching, users temporarily coarsen their data, exact match on these coarsened data, and then run their analysis on the uncoarsened, matched data. Coarsened exact matching bounds the degree of model dependence and causal effect estimation error by ex ante user choice, is monotonic imbalance bounding (so that reducing the maximum imbalance on one variable has no effect on others), does not require a separate procedure to restrict data to common support, meets the congruence principle, is approximately invariant to measurement error, balances all nonlinearities and interactions in sample (i.e., not merely in expectation), and works with multiply imputed datasets. Other matching methods inherit many of the coarsened exact matching method’s properties when applied to further match data preprocessed by coarsened exact matching.

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File URL: http://repec.org/bost10/cem-stconf.pdf
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Bibliographic Info

Paper provided by Stata Users Group in its series BOS10 Stata Conference with number 8.

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Date of creation: 20 Jul 2010
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Handle: RePEc:boc:bost10:8

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Web page: http://stata.com/meeting/boston10/
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