The Annals of Statistics
- Ann. Statist.
- Volume 34, Number 3 (2006), 1233-1269.
Consistency of Bayes estimators of a binary regression function
When do nonparametric Bayesian procedures “overfit”? To shed light on this question, we consider a binary regression problem in detail and establish frequentist consistency for a certain class of Bayes procedures based on hierarchical priors, called uniform mixture priors. These are defined as follows: let ν be any probability distribution on the nonnegative integers. To sample a function f from the prior πν, first sample m from ν and then sample f uniformly from the set of step functions from [0,1] into [0,1] that have exactly m jumps (i.e., sample all m jump locations and m+1 function values independently and uniformly). The main result states that if a data-stream is generated according to any fixed, measurable binary-regression function f0≢1/2, then frequentist consistency obtains: that is, for any ν with infinite support, the posterior of πν concentrates on any L1 neighborhood of f0. Solution of an associated large-deviations problem is central to the consistency proof.
Ann. Statist., Volume 34, Number 3 (2006), 1233-1269.
First available in Project Euclid: 10 July 2006
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Coram, Marc; Lalley, Steven P. Consistency of Bayes estimators of a binary regression function. Ann. Statist. 34 (2006), no. 3, 1233--1269. doi:10.1214/009053606000000236. https://projecteuclid.org/euclid.aos/1152540748