| http://www.w3.org/ns/prov#value | - The Matching package for R. Journal of Statistical Software 42(7). http://www.jstatsoft.org/v42/i07 Uses automated procedure to select matches, based on univariate and multivariate balance diagnostics Primarily 1:M matching (where M is a positive integer), allows matching with or without replacement, caliper, exact Includes built-in effect and variance estimation procedures twang http://cran.r-pro
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