On the approximation of one Markov chain by another

Details On the approximation of one Markov chain by another On the approximation of one Markov chain by another

2003-12-17

arxiv.org/abs/math/0312340v1

Mathematics

Probability

18 pages

Scientific paper

Motivated by applications in Markov chain Monte Carlo, we discuss what it means for one Markov chain to be an approximation to another. Specifically included in that discussion are situations in which a Markov chain with continuous state space is approximated by one with finite state space. A simple sufficient condition for close approximation is derived, which indicates the existence of three distinct approximation regimes. Counterexamples are presented to show that these regimes are real and not artifacts of the proof technique. An application to the ``ball walk'' of Lov\'asz and Simonovits is provided as an illustrative example.

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