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The Containment Condition and Adapfail Algorithms

Published online by Cambridge University Press:  30 January 2018

Krzysztof Łatuszyński*
Affiliation:
University of Warwick
Jeffrey S. Rosenthal*
Affiliation:
University of Toronto
*
∗ Postal address: Department of Statistics, University of Warwick, Coventry CV4 7AL, UK. Email address: latuch@gmail.com
∗∗ Postal address: Department of Statistics, University of Toronto, Toronto, Ontario M5S 3G3, Canada. Email address: jeff@math.toronto.edu
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Abstract

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This short note investigates convergence of adaptive Markov chain Monte Carlo algorithms, i.e. algorithms which modify the Markov chain update probabilities on the fly. We focus on the containment condition introduced Roberts and Rosenthal (2007). We show that if the containment condition is notsatisfied, then the algorithm will perform very poorly. Specifically, with positive probability, the adaptive algorithm will be asymptotically less efficient then any nonadaptive ergodic MCMC algorithm. We call such algorithms AdapFail, and conclude that they should not be used.

Information

Type
Research Article
Copyright
© Applied Probability Trust