Two recent papers, Deaton (2009), and Heckman and Urzua (2009), argue against what they see as an excessive and inappropriate use of experimental and quasi-experimental methods in empirical work in economics in the last decade. They specifically question the increased use of instrumental variables and natural experiments in labor economics, and of randomized experiments in development economics. In these comments I will make the case that this move towards shoring up the internal validity of estimates, and towards clarifying the description of the population these estimates are relevant for, has been important and beneficial in increasing the credibility of empirical work in economics. I also address some other concerns raised by the Deaton and Heckman-Urzua papers.
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Paper provided by National Bureau of Economic Research, Inc in its series NBER Working Papers with number
14896.
Length: Date of creation: Apr 2009 Date of revision: Handle: RePEc:nbr:nberwo:14896
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Find related papers by JEL classification: C10 - Mathematical and Quantitative Methods - - Econometric and Statistical Methods: General - - - General C50 - Mathematical and Quantitative Methods - - Econometric Modeling - - - General C90 - Mathematical and Quantitative Methods - - Design of Experiments - - - General
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