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Does Waste Recycling Really Improve the Multi-Proposal Metropolis–Hastings algorithm? an Analysis Based on Control Variates

Published online by Cambridge University Press:  14 July 2016

Jean-Françcois Delmas*
Affiliation:
Université Paris-Est
Benjamin Jourdain*
Affiliation:
Université Paris-Est
*
∗ Postal address: CERMICS, École des Ponts, 6–8 Avenue Blaise Pascal, Champs-sur-Marne, 77455 Marne La Vallée, France.
∗ Postal address: CERMICS, École des Ponts, 6–8 Avenue Blaise Pascal, Champs-sur-Marne, 77455 Marne La Vallée, France.
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Abstract

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The waste-recycling Monte Carlo (WRMC) algorithm introduced by physicists is a modification of the (multi-proposal) Metropolis–Hastings algorithm, which makes use of all the proposals in the empirical mean, whereas the standard (multi-proposal) Metropolis–Hastings algorithm uses only the accepted proposals. In this paper we extend the WRMC algorithm to a general control variate technique and exhibit the optimal choice of the control variate in terms of the asymptotic variance. We also give an example which shows that, in contradiction to the intuition of physicists, the WRMC algorithm can have an asymptotic variance larger than that of the Metropolis–Hastings algorithm. However, in the particular case of the Metropolis–Hastings algorithm called the Boltzmann algorithm, we prove that the WRMC algorithm is asymptotically better than the Metropolis–Hastings algorithm. This last property is also true for the multi-proposal Metropolis–Hastings algorithm. In this last framework we consider a linear parametric generalization of WRMC, and we propose an estimator of the explicit optimal parameter using the proposals.

Information

Type
Research Article
Copyright
Copyright © Applied Probability Trust 2009