Journal
STATISTICA SINICA
Volume 22, Issue 1, Pages 173-205Publisher
STATISTICA SINICA
DOI: 10.5705/ss.2009.265
Keywords
Double robustness; instrumental variable estimation; local efficiency; partial linear model
Categories
Funding
- Kyoto University
- National Science Foundation [SES-0961971, DMS-0749718]
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Instrumental variable (IV) estimation typically requires the user to correctly specify the relationship between the regressors and the outcome to obtain a consistent estimate of the effects of the treatments. This paper proposes doubly robust IV regression estimators that only require the user to either correctly specify the relationship between the measured confounding variables (i.e., included exogenous variables) and the outcome, or the relationship between the measured confounding variables and the IVs. We derive the asymptotic properties of the doubly robust IV regression estimators and investigate their finite sample properties in a simulation study. We apply our method to a study of the effect of education on earnings.
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