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Bayesian Multimodel Inference by RJMCMC: A Gibbs Sampling Approach

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  • Richard J. Barker
  • William A. Link

Abstract

Bayesian multimodel inference treats a set of candidate models as the sample space of a latent categorical random variable, sampled once; the data at hand are modeled as having been generated according to the sampled model. Model selection and model averaging are based on the posterior probabilities for the model set. Reversible-jump Markov chain Monte Carlo (RJMCMC) extends ordinary MCMC methods to this meta-model. We describe a version of RJMCMC that intuitively represents the process as Gibbs sampling with alternating updates of a categorical variable M (for Model ) and a "palette" of parameters , from which any of the model-specific parameters can be calculated. Our representation makes plain how model-specific Monte Carlo outputs (analytical or numerical) can be post-processed to compute model weights or Bayes factors. We illustrate the procedure with several examples.

Suggested Citation

  • Richard J. Barker & William A. Link, 2013. "Bayesian Multimodel Inference by RJMCMC: A Gibbs Sampling Approach," The American Statistician, Taylor & Francis Journals, vol. 67(3), pages 150-156, August.
    • Handle: RePEc:taf:amstat:v:67:y:2013:i:3:p:150-156
    DOI: 10.1080/00031305.2013.791644
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    Cited by:

    1. Riccardo (Jack) Lucchetti & Luca Pedini, 2020. "ParMA: Parallelised Bayesian Model Averaging for Generalised Linear Models," Working Papers 2020:28, Department of Economics, University of Venice "Ca' Foscari".
    2. Richard J. Barker & Matthew R. Schofield & Janine A. Wright & Alain C. Frantz & Chris Stevens, 2014. "Closed-population capture–recapture modeling of samples drawn one at a time," Biometrics, The International Biometric Society, vol. 70(4), pages 775-782, December.

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