approxmatch: Approximately Optimal Fine Balance Matching with Multiple Groups
Tools for constructing a matched design with multiple comparison groups.
Further specifications of refined covariate balance restriction and exact match on
covariate can be imposed. Matches are approximately optimal in the sense that the
cost of the solution is at most twice the optimal cost, Crama and Spieksma (1992)
<doi:10.1016/0377-2217(92)90078-N>, Karmakar, Small and Rosenbaum (2019)
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