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Blopmatching: R library to implement the BLOP matching estimator developed by Díaz, Rau, and Rivera (2015). The BLOP matching estimator determines endogenously the neighbors used and weights by optimizing a covariate balancing criterion. The estimator is based on finding, for each unit that needs to be matched, sets of observations such that a convex combination of them has the same covariate values as the unit needing matching or with minimized distance between them.

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