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dc.contributor.author Hotz, V.J. en_US
dc.contributor.author Crump, Richard en_US
dc.contributor.author Imbens, Guido en_US
dc.contributor.author Mitnik, Oscar en_US
dc.date.accessioned 2010-03-09T15:38:47Z
dc.date.available 2010-03-09T15:38:47Z
dc.date.issued 2008 en_US
dc.identifier.uri http://hdl.handle.net/10161/1998
dc.description.abstract A large part of the recent literature on program evaluation has focused on estimation of the average effect of the treatment under assumptions of unconfoundedness or ignorability following the seminal work by Rubin (1974) and Rosenbaum and Rubin (1983). In many cases however, researchers are interested in the effects of programs beyond estimates of the overall average or the average for the subpopulation of treated individuals. It may be of substantive interest to investigate whether there is any subpopulation for which a program or treatment has a nonzero average effect, or whether there is heterogeneity in the effect of the treatment. The hypothesis that the average effect of the treatment is zero for all subpopulations is also important for researchers interested in assessing assumptions concerning the selection mechanism. In this paper we develop two nonparametric tests. The first test is for the null hypothesis that the treatment has a zero average effect for any subpopulation defined by covariates. The second test is for the null hypothesis that the average effect conditional on the covariates is identical for all subpopulations, in other words, that there is no heterogeneity in average treatment effects by covariates. Sacrificing some generality by focusing on these two specific null hypotheses we derive tests that are straightforward to implement. en_US
dc.format.extent 233881 bytes
dc.format.mimetype application/pdf
dc.language.iso en_US
dc.publisher Review of Economics and Statistics en_US
dc.subject Average treatment effects en_US
dc.subject Treatment effect heterogeneity en_US
dc.subject Unconfoundedness en_US
dc.subject causality en_US
dc.title Nonparametric Tests for Treatment Effect Heterogeneity en_US
dc.type Journal Article en_US
dc.department Economics

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