Timothy B. Armstrong, Michal Kolesár, Mikkel Plagborg‐Møller
We construct robust empirical Bayes confidence intervals (EBCIs) in a normal means problem. The intervals are centered at the usual linear empirical Bayes estimator, but use a critical value accounting for shrinkage. Parametric EBCIs that assume a normal distribution for the means (Morris (1983b)) may substantially undercover when this assumption is violated. In contrast, our EBCIs control coverage regardless of the means distribution, while remaining close in length to the parametric EBCIs when the means are indeed Gaussian. If the means are treated as fixed, our EBCIs have an average coverage guarantee: the coverage probability is at least 1 − α on average across the n EBCIs for each of the means. Our empirical application considers the effects of U.S. neighborhoods on intergenerational mobility.
Supplement to "Robust Empirical Bayes Confidence Intervals"
Timothy B. Armstrong, Michal Kolesár and Mikkel Plagborg-Møller
This supplement is organized as follows. Supplemental Appendix D gives proofs of the formal results in the main text and details on Assumption C.5. Supplemental Appendix E gives details on the simulations. Supplemental Appendix F discusses the power of tests based on our empirical Bayes confidence intervals (EBCIs), and Supplemental Appendix G works through examples of the general shrinkage estimators in Section 6.1.
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