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Rare-Event Simulation of Heavy-Tailed Random Walks by Sequential Importance Sampling and Resampling

Published online by Cambridge University Press:  04 January 2016

Hock Peng Chan*
Affiliation:
National University of Singapore
Shaojie Deng
Affiliation:
Microsoft
Tze-Leung Lai*
Affiliation:
Stanford University
*
Postal address: Department of Statistics and Applied Probability, National University of Singapore, Science Drive 1, 119260, Singapore.
∗∗ Postal address: Statistics Department, Stanford University, Stanford, CA 94305, USA.
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Abstract

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We introduce a new approach to simulating rare events for Markov random walks with heavy-tailed increments. This approach involves sequential importance sampling and resampling, and uses a martingale representation of the corresponding estimate of the rare-event probability to show that it is unbiased and to bound its variance. By choosing the importance measures and resampling weights suitably, it is shown how this approach can yield asymptotically efficient Monte Carlo estimates.

Type
General Applied Probability
Copyright
© Applied Probability Trust 

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