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).
