NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH
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Sam Asher

Johns Hopkins SAIS
1717 Massachusetts Ave NW
Office 743a
Washington, DC 20433

E-Mail: EmailAddress: hidden: you can email any NBER-related person as first underscore last at nber dot org
Institutional Affiliation: Johns Hopkins University

NBER Working Papers and Publications

March 2020Comparing Intergenerational Educational Mobility for Minorities Around the World
with Paul Novosad, Charlie Rafkin
in Measuring and Understanding the Distribution and Intra/Inter-Generational Mobility of Income and Wealth, Raj Chetty, John N. Friedman, Janet C. Gornick, Barry Johnson, and Arthur Kennickell, editors
December 2016Classification Trees for Heterogeneous Moment-Based Models
with Denis Nekipelov, Paul Novosad, Stephen P. Ryan: w22976
A basic problem in applied settings is that different parameters may apply to the same model in different populations. We address this problem by proposing a method using moment trees; leveraging the basic intuition of a classification tree, our method partitions the covariate space into disjoint subsets and fits a set of moments within each subspace. We prove the consistency of this estimator and show standard rates of convergence apply post-model selection. Monte Carlo evidence demonstrates the excellent small sample performance and faster-than-parametric convergence rates of the model selection step in two common empirical contexts. Finally, we showcase the usefulness of our approach by estimating heterogeneous treatment effects in a regression discontinuity design in a development sett...
 
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