The Annals of Statistics
- Ann. Statist.
- Volume 41, Number 5 (2013), 2359-2390.
Quasi-Bayesian analysis of nonparametric instrumental variables models
This paper aims at developing a quasi-Bayesian analysis of the nonparametric instrumental variables model, with a focus on the asymptotic properties of quasi-posterior distributions. In this paper, instead of assuming a distributional assumption on the data generating process, we consider a quasi-likelihood induced from the conditional moment restriction, and put priors on the function-valued parameter. We call the resulting posterior quasi-posterior, which corresponds to “Gibbs posterior” in the literature. Here we focus on priors constructed on slowly growing finite-dimensional sieves. We derive rates of contraction and a nonparametric Bernstein–von Mises type result for the quasi-posterior distribution, and rates of convergence for the quasi-Bayes estimator defined by the posterior expectation. We show that, with priors suitably chosen, the quasi-posterior distribution (the quasi-Bayes estimator) attains the minimax optimal rate of contraction (convergence, resp.). These results greatly sharpen the previous related work.
Ann. Statist., Volume 41, Number 5 (2013), 2359-2390.
First available in Project Euclid: 5 November 2013
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Kato, Kengo. Quasi-Bayesian analysis of nonparametric instrumental variables models. Ann. Statist. 41 (2013), no. 5, 2359--2390. doi:10.1214/13-AOS1150. https://projecteuclid.org/euclid.aos/1383661267
- Supplementary material: Supplement to “Quasi-Bayesian analysis of nonparametric instrumental variables models”. This supplemental file contains the additional technical proofs omitted in the main text, and some technical tools used in the proofs.