K 10 svn:author V 3 wen K 8 svn:date V 27 2015-12-18T02:17:57.969216Z K 7 svn:log V 283 MatchIt selects matched samples of the 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. WWW: http://gking.harvard.edu/matchit END