Amanda Kowalski (Yale) will present:
"Using an Experiment to Learn about Selection, Treatment Effect Heterogeneity, and External Validity"
at 3:20pm on Wednesday, March 1, 2017 in 310 Silsby
***PLEASE NOTE: THE NEW TIME SLOT FOR SEMINARS IS 3:20 - 4:45PM***

Please sign up for a meeting, lunch, or dinner at:

https://docs.google.com/spreadsheets/d/13iyiJS7PY4zhF5cU9JpoZXIqMpIyoAyY3pEh8d7pnRM/edit?usp=sharing


Abstract


I examine treatment effect heterogeneity within an experiment to inform external validity. The local average treatment effect (LATE) gives and 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.






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