Abstract

http://ssrn.com/abstract=2305788
 
 

References (25)



 


 



Combining Double Sampling and Bounds to Address Non-Ignorable Missing Outcomes in Randomized Experiments


Alexander Coppock


Independent

Alan Gerber


Yale University - Department of Political Science

Donald P. Green


Columbia University - Department of Political Science

Holger L. Kern


Florida State University - Department of Political Science

June 26, 2016


Abstract:     
Missing outcome data plague many randomized experiments. Common solutions rely on ignorability assumptions that may not be credible in all applications. We propose a method for confronting missing outcome data that makes fairly weak assumptions but can still yield informative bounds on the average treatment effect. Our approach is based on a combination of the double sampling design and non-parametric worst-case bounds. We derive a worst-case bounds estimator under double sampling and provide analytic expressions for variance estimators and confidence intervals. We also propose a method for covariate adjustment using post-stratification and a sensitivity analysis for non-ignorable missingness. Finally, we illustrate the utility of our approach using Monte Carlo simulations and a placebo-controlled randomized field experiment on the effects of persuasion on social attitudes with survey-based outcome measures.

Number of Pages in PDF File: 24

Keywords: causal inference, experiments, missing data, bounds, ignorability


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Date posted: August 5, 2013 ; Last revised: June 27, 2016

Suggested Citation

Coppock, Alexander and Gerber, Alan and Green, Donald P. and Kern, Holger L., Combining Double Sampling and Bounds to Address Non-Ignorable Missing Outcomes in Randomized Experiments (June 26, 2016). Available at SSRN: http://ssrn.com/abstract=2305788 or http://dx.doi.org/10.2139/ssrn.2305788

Contact Information

Alexander Coppock
Independent
No Address Available
Alan Gerber
Yale University - Department of Political Science ( email )
Box 208269
New Haven, DC 06520-8269
United States
203-432-5232 (Phone)
Donald P. Green
Columbia University - Department of Political Science ( email )
7th Floor, International Affairs Bldg.
420 W. 118th Street
New York, NY 10027
United States
Holger L. Kern (Contact Author)
Florida State University - Department of Political Science ( email )
Tallahassee, FL 30306
United States
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