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• W2951676909 abstract "This work focuses on sampling from hidden Markov models (Cappe et al, 2005) whose observations have intractable density functions. We develop a new sequential Monte Carlo (Doucet et al, 2000 and Gordon et al, 1993) algorithm and a new particle marginal Metropolis-Hastings (Andrieu et al, 2010) algorithm for these purposes. We build from Jasra, et al (2013) and Whiteley, et al (2013) to construct the sequential Monte Carlo (SMC) algorithm (which we call the alive twisted particle filter). Like the alive particle filter of Jasra, et al (2013), our new SMC algorithm adopts an approximate Bayesian computation (Tavare et al, 1997) estimate of the HMM. Our alive twisted particle filter also uses a twisted proposal as in Whiteley, et al (2013) to obtain a low-variance estimate of the HMM normalising constant. We demonstrate via numerical examples that, in some scenarios, this estimate has a much lower variance than that of the estimate obtained via the alive particle filter. The low variance of this normalising constant estimate encourages the implementation of our SMC algorithm within a particle marginal Metropolis-Hastings (PMMH) scheme, and we call the resulting methodology ``alive twisted PMMH''. We numerically demonstrate on a stochastic volatility model how our alive twisted PMMH can converge faster than the standard alive PMMH of Jasra, et al (2013)." @default.
• W2951676909 created "2019-06-27" @default.
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• W2951676909 date "2013-08-21" @default.
• W2951676909 modified "2023-09-27" @default.
• W2951676909 title "Twisting the Alive Particle Filter" @default.
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