CEM: Stata module to perform Coarsened Exact Matching

Matthew Blackwell (), Stefano Iacus (), Gary King and Giuseppe Porro
Additional contact information
Matthew Blackwell: Harvard University

Statistical Software Components from Boston College Department of Economics

Abstract: The cem package provides 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.

Language: Stata
Requires: Stata version 10.1
Keywords: imbalance; matching; coarsened exact matching; inference (search for similar items in EconPapers)
Date: 2010-02-19, Revised 2020-02-15
Note: This module should be installed from within Stata by typing "ssc install cem". Please quit Stata after installing and restart to reindex Mata libraries. The module is made available under terms of the GPL v3 (https://www.gnu.org/licenses/gpl-3.0.txt). Windows users should not attempt to download these files with a web browser.
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http://fmwww.bc.edu/repec/bocode/c/cem.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/c/cem.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/i/imb.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/i/imb.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/l/listwise.ado program code (text/plain)
http://fmwww.bc.edu/repec/bocode/l/listwise.sthlp help file (text/plain)
http://fmwww.bc.edu/repec/bocode/l/lcem.mlib Mata object library (application/x-stata)
http://fmwww.bc.edu/repec/bocode/c/cem-mata.do program code (text/plain)

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