Classification Trees for Heterogeneous Moment-Based Models
Working PapersAuthors: Sam Asher, Denis Nekipelov, Paul Novosad, and Stephen P. Ryan Abstract: 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 […]
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The Welfare Effects of Supply-Side Regulations in Medicare Part D
Working PapersAuthors: Francesco Decarolis, Maria Polyakova, Stephen P. Ryan Abstract: The efficiency of publicly-subsidized, privately-provisioned social insurance programs depends on the interaction between insurer behavior and public subsidies. We study this interaction within Medicare Part D Prescription Drug Plan (PDP) markets. Using a structural model of supply and demand, we find: consumers purchase too few and […]
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