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• W2022681226 abstract "Recently developed particle flow algorithms provide an alternative to importance sampling for drawing particles from a posterior distribution, and a number of particle filters based on this principle have been proposed. Samples are drawn from the prior and then moved according to some dynamics over an interval of pseudo-time such that their final values are distributed according to the desired posterior. In practice, implementing a particle flow sampler requires multiple layers of approximation, with the result that the final samples do not in general have the correct posterior distribution. In this article we consider using an approximate Gaussian flow for sampling with a class of nonlinear Gaussian models. We use the particle flow within an importance sampler, correcting for the discrepancy between the target and actual densities with importance weights. We present a suitable numerical integration procedure for use with this flow and an accompanying step-size control algorithm. In a filtering context, we use the particle flow to sample from the optimal importance density, rather than the filtering density itself, avoiding the need to make analytical or numerical approximations of the predictive density. Simulations using particle flow importance sampling within a particle filter demonstrate significant improvement over standard approximations of the optimal importance density, and the algorithm falls within the standard sequential Monte Carlo framework." @default.
• W2022681226 created "2016-06-24" @default.
• W2022681226 creator A5020836373 @default.
• W2022681226 creator A5072888185 @default.
• W2022681226 date "2016-04-02" @default.
• W2022681226 modified "2023-10-03" @default.
• W2022681226 title "Approximations of the Optimal Importance Density Using Gaussian Particle Flow Importance Sampling" @default.
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• W2022681226 doi "https://doi.org/10.1080/01621459.2015.1038387" @default.
• W2022681226 hasPublicationYear "2016" @default.
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