Giuseppe Porro (Department of Economics and Statistics, University of Trieste, P.le Europa 1, I-34127 Trieste, Italy) Stefano Maria Iacus (Department of Economics, Business and Statistics, University of Milan, Via Conservatorio 7, I-20122 Milano, Italy)
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In this paper we introduce the Random Recursive Partitioning (RRP) matching method. RRP generates a proximity matrix which might be useful in econometric applications like average treatment effect estimation. RRP is a Monte Carlo method that randomly generates non-empty recursive partitions of the data and evaluates the proximity between two observations as the empirical frequency they fall in a same cell of these random partitions over all Monte Carlo replications. From the proximity matrix it is possible to derive both graphical and analytical tools to evaluate the extent of the common support between data sets. The RRP method is “honest” in that it does not match observations “at any cost”: if data sets are separated, the method clearly states it.
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