Seminarios académicos y conferencias
Using an Experiment to Learn about Selection, Treatment Effect Heterogeneity, and External Validity
13 diciembre 2017 - 15:30 hrs.
Sala 113, Facultad de Ciencias Económicas y Administrativas UCVer investigación
Abstract: I examine treatment effect heterogeneity within an experiment to inform external validity. The local average treatment effect (LATE) gives an average treatment effect for compliers. I bound and estimate average treatment effects for always takers and never takers by extending marginal treatment effect methods. I use these methods to separate selection from treatment effect heterogeneity, generalizing the comparison of OLS to LATE. Applying these methods to the Oregon Health Insurance Experiment, I find that the treatment effect of insurance on emergency room utilization decreases from always takers to compliers to never takers. Previous utilization explains a large share of the treatment effect heterogeneity. Extrapolations show that other expansions could increase or decrease utilization.