Poorly measured confounders are more useful on the left than on the right / Zhuan Pei (Cornell University and IZA), Jörn-Steffen Pischke (London School of Economics and IZA), Hannes Schwandt (University of Zürich and IZA) ; IZA, Institute of Labor Economics. Bonn, Germany : IZA Institute of Labor Economics, March 2017
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