NATIONAL BUREAU OF ECONOMIC RESEARCH
NATIONAL BUREAU OF ECONOMIC RESEARCH

Doing More When You're Running LATE: Applying Marginal Treatment Effect Methods to Examine Treatment Effect Heterogeneity in Experiments

Amanda E. Kowalski

NBER Working Paper No. 22363
Issued in June 2016
NBER Program(s):Aging, Health Care, Health Economics, Labor Studies, Public Economics, Technical Working Papers

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.

download in pdf format
   (1501 K)

email paper

The NBER Bulletin on Aging and Health provides summaries of publications like this.  You can sign up to receive the NBER Bulletin on Aging and Health by email.

Machine-readable bibliographic record - MARC, RIS, BibTeX

Document Object Identifier (DOI): 10.3386/w22363

Users who downloaded this paper also downloaded* these:
Brown, Kowalski, and Lurie w20835 Medicaid as an Investment in Children: What is the Long-Term Impact on Tax Receipts?
Hoffman and Burks w23240 Worker Overconfidence: Field Evidence and Implications for Employee Turnover and Returns from Training
Kowalski w20887 What Do Longitudinal Data on Millions of Hospital Visits Tell us About The Value of Public Health Insurance as a Safety Net for the Young and Privately Insured?
Razin w23251 Globalization Policies and Israel’s Brain Drain
Bertanha and Imbens w20773 External Validity in Fuzzy Regression Discontinuity Designs
 
Publications
Activities
Meetings
NBER Videos
Themes
Data
People
About

National Bureau of Economic Research, 1050 Massachusetts Ave., Cambridge, MA 02138; 617-868-3900; email: info@nber.org

Contact Us