Bayes and empirical-Bayes multiplicity adjustment in the variable-selection problem

Details Bayes and empirical-Bayes multiplicity adjustment in the variable-selection problem Bayes and empirical-Bayes multiplicity adjustment in the variable-selection problem

2010-11-10

arxiv.org/abs/1011.2333v1

Annals of Statistics 2010, Vol. 38, No. 5, 2587-2619

Mathematics

Statistics Theory

Published in at http://dx.doi.org/10.1214/10-AOS792 the Annals of Statistics (http://www.imstat.org/aos/) by the Institute of

Scientific paper

10.1214/10-AOS792

This paper studies the multiplicity-correction effect of standard Bayesian variable-selection priors in linear regression. Our first goal is to clarify when, and how, multiplicity correction happens automatically in Bayesian analysis, and to distinguish this correction from the Bayesian Ockham's-razor effect. Our second goal is to contrast empirical-Bayes and fully Bayesian approaches to variable selection through examples, theoretical results and simulations. Considerable differences between the two approaches are found. In particular, we prove a theorem that characterizes a surprising aymptotic discrepancy between fully Bayes and empirical Bayes. This discrepancy arises from a different source than the failure to account for hyperparameter uncertainty in the empirical-Bayes estimate. Indeed, even at the extreme, when the empirical-Bayes estimate converges asymptotically to the true variable-inclusion probability, the potential for a serious difference remains.

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