Discussion on the paper by Brooks, Giudici and Roberts
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对 Brooks、Giudici 与 Roberts 论文的讨论AI 解读 ↓
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This paper aims to develop general strategies for improving jumps between models in reversible jump Markov chain Monte Carlo (MCMC) algorithms, which is quite an important and timely goal. Indeed, in practical implementations of the method, we usually find that the choice of proposals is paramount: in many cases, the ‘natural choice’ leads to a zero acceptance probability and the construction of well-tuned moves is often quite costly. Given that the reversible jump MCMC method is an essential part of the Bayesian toolbox, at least in Bayesian exploratory analysis, a debate is needed for more global strategies on the choice of proposals. The first appealing feature, at the core of the paper, is that image parameters that give a Metropolis–Hastings probability of 1 should be identified as pivotal quantities, just like the current value is a pivot for the random-walk Metropolis–Hastings move. The authors then propose ‘higher order’ methods where some derivatives of the probability are set to 0, but I find this less appealing, because it considerably adds to the complexity of the algorithm.
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