Convergence analysis of a collapsed gibbs sampler for bayesian vector autoregressions

Karl Oskar Ekvall, Galin L. Jones

Research output: Contribution to journalArticlepeer-review

Abstract

We study the convergence properties of a collapsed Gibbs sampler for Bayesian vector autoregressions with predictors, or exogenous vari-ables. The Markov chain generated by our algorithm is shown to be geo-metrically ergodic regardless of whether the number of observations in the underlying vector autoregression is small or large in comparison to the or-der and dimension of it. In a convergence complexity analysis, we also give conditions for when the geometric ergodicity is asymptotically stable as the number of observations tends to infinity. Specifically, the geometric convergence rate is shown to be bounded away from unity asymptotically, either almost surely or with probability tending to one, depending on what is as-sumed about the data generating process. This result is one of the first of its kind for practically relevant Markov chain Monte Carlo algorithms. Our convergence results hold under close to arbitrary model misspecification.

Original languageEnglish (US)
Pages (from-to)691-721
Number of pages31
JournalElectronic Journal of Statistics
Volume15
Issue number1
DOIs
StatePublished - 2021

Bibliographical note

Funding Information:
∗Substantial parts of the work was done while the author was at the University of Minnesota and Vienna University of Technology (TU Wien), and was partially support by FWF (Austrian Science Fund, https://www.fwf.ac.at/en/) [P30690-N35].

Publisher Copyright:
© 2021, Institute of Mathematical Statistics. All rights reserved.

Copyright:
Copyright 2021 Elsevier B.V., All rights reserved.

Keywords

  • Bayesian vector autoregression
  • Convergence complexity analysis
  • Geometric er-godicity
  • Gibbs sampler
  • Markov chain Monte Carlo

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