cem: Coarsened Exact Matching in Stata

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cem: Coarsened Exact Matching in Stata

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dc.contributor.author King, Gary
dc.contributor.author Blackwell, Matthew
dc.contributor.author Iacus, Stefano
dc.contributor.author Porro, Giuseppe
dc.date.accessioned 2010-07-19T19:44:57Z
dc.date.issued 2010
dc.identifier.citation Blackwell, Matthew, Stefano Iacus, Gary King, and Giuseppe Porro. 2010. cem: Coarsened exact matching in stata. Stata Journal 9(4): 524-546. en_US
dc.identifier.issn 1536-867X en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:4314511
dc.description.abstract This paper introduces a Stata implementation of Coarsened Exact Matching (CEM), a new method for improving the estimation of causal effects by reducing imbalance in co-variates between treated and control groups. CEM is faster, easier to use and understand, requires fewer assumptions, more easily automated, and possesses more attractive statistical properties for many applications than existing matching methods. In CEM, users temporarily coarsen their data, exact match on these coarsened data, then run their analysis on the uncoarsened, matched data. CEM bounds the degree of model dependence and causal effect estimation error by ex ante user choice, is montonic imbalance bounding (so that reducing the maximum imbalance on one variable has no e ect 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 data sets. Other matching methods inheret [sic] many of CEM's properties when applied to further match data preprocessed by CEM. The library cem implements the CEM algorithm in Stata. en_US
dc.description.sponsorship Government en_US
dc.language.iso en_US en_US
dc.publisher StataCorp en_US
dc.relation.isversionof http://www.stata-journal.com/ en_US
dc.relation.hasversion http://gking.harvard.edu/files/cem-stata.pdf en_US
dash.license LAA
dc.title cem: Coarsened Exact Matching in Stata en_US
dc.type Journal Article en_US
dc.description.version Accepted Manuscript en_US
dc.relation.journal Stata Journal en_US
dash.depositing.author King, Gary
dc.date.available 2010-07-19T19:44:57Z

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  • FAS Scholarly Articles [7594]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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