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CEM: Software for Coarsened Exact Matching

Stefano Iacus, Gary King, Giuseppe Porro. 2009. "CEM: Software for Coarsened Exact Matching". Journal of Statistical Software, 30(9).

Abstract

This program is designed to improve causal inference via a method of matching that is widely applicable in observational data and easy to understand and use (if you understand how to draw a histogram, you will understand this method). The program implements the coarsened exact matching (CEM) algorithm, described below. CEM may be used alone or in combination with any existing matching method. This algorithm, and its statistical properties, are described in Iacus, King, and Porro (2008).