R package MatchIt
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README.md

MatchIt: Nonparametric Preprocessing for Parametric Causal Inference Build Status CRAN_Status_Badge

MatchIt selects matched samples of the original treated and control groups with similar covariate distributions -- can be used to match exactly on covariates, to match on propensity scores, or perform a variety of other matching procedures. The package also implements a series of recommendations offered in Ho, Imai, King, and Stuart (2007) <DOI:10.1093/pan/mpl013>.