Abstract
We develop particle Gibbs samplers for static-parameter estimation in discretely observed piecewise deterministic process (PDPs). PDPs are stochastic processes that jump randomly at a countable number of stopping times but otherwise evolve deterministically in continuous time. A sequential Monte Carlo (SMC) sampler for filtering in PDPs has recently been proposed. We first provide new insight into the consequences of an approximation inherent within that algorithm. We then derive a new representation of the algorithm. It simplifies ensuring that the importance weights exist and also allows the use of variance-reduction techniques known as backward and ancestor sampling. Finally, we propose a novel Gibbs step that improves mixing in particle Gibbs samplers whose SMC algorithms make use of large collections of auxiliary variables, such as many instances of SMC samplers. We provide a comparison between the two particle Gibbs samplers for PDPs developed in this paper. Simulation results indicate that they can outperform reversible-jump MCMC approaches.
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Axel Finke was supported by Engineering and Physical Sciences Research Council (EPSRC) Doctoral Training Grant EP/J500586/1. Adam M. Johansen was partially supported by EPSRC Grant EP/I017984/1 and is grateful to the Isaac Newton Institute for a visiting fellowship which allowed him time to work on this manuscript during the programme: Inference for Change-Point and Related Processes. Dario Spanò’s research was partially funded by CRiSM, an EPSRC/HEFCE-funded grant.
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Finke, A., Johansen, A.M. & Spanò, D. Static-parameter estimation in piecewise deterministic processes using particle Gibbs samplers. Ann Inst Stat Math 66, 577–609 (2014). https://doi.org/10.1007/s10463-014-0455-z
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DOI: https://doi.org/10.1007/s10463-014-0455-z