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Weak Convergence Rates of Population Versus Single-Chain Stochastic Approximation MCMC Algorithms

Published online by Cambridge University Press:  22 February 2016

Qifan Song*
Affiliation:
Texas A&M University
Mingqi Wu*
Affiliation:
Shell Global Solutions (US) Inc.
Faming Liang*
Affiliation:
Texas A&M University
*
Current address: Department of Statistics, Purdue University, West Lafayette, IN 47907, USA.
∗∗ Postal address: Shell Technology Center Houston, 3333 Highway 6 South, Houston, TX 77082, USA.
∗∗∗ Current address: Department of Biostatistics, University of Florida, Gainesville, FL 321611, USA. Email address: faliang@ufl.edu
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Abstract

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In this paper we establish the theory of weak convergence (toward a normal distribution) for both single-chain and population stochastic approximation Markov chain Monte Carlo (MCMC) algorithms (SAMCMC algorithms). Based on the theory, we give an explicit ratio of convergence rates for the population SAMCMC algorithm and the single-chain SAMCMC algorithm. Our results provide a theoretic guarantee that the population SAMCMC algorithms are asymptotically more efficient than the single-chain SAMCMC algorithms when the gain factor sequence decreases slower than O(1 / t), where t indexes the number of iterations. This is of interest for practical applications.

Information

Type
General Applied Probability
Copyright
© Applied Probability Trust