TY - JOUR

T1 - Linear variance bounds for particle approximations of time-homogeneous Feynman-Kac formulae

AU - Whiteley, Nick

AU - Kantas, Nikolas

AU - Jasra, Ajay

N1 - Generated from Scopus record by KAUST IRTS on 2019-11-20

PY - 2012/4/1

Y1 - 2012/4/1

N2 - This article establishes sufficient conditions for a linear-in-time bound on the non-asymptotic variance for particle approximations of time-homogeneous Feynman-Kac formulae. These formulae appear in a wide variety of applications including option pricing in finance and risk sensitive control in engineering. In direct Monte Carlo approximation of these formulae, the non-asymptotic variance typically increases at an exponential rate in the time parameter. It is shown that a linear bound holds when a non-negative kernel, defined by the logarithmic potential function and Markov kernel which specify the Feynman-Kac model, satisfies a type of multiplicative drift condition and other regularity assumptions. Examples illustrate that these conditions are general and flexible enough to accommodate two rather extreme cases, which can occur in the context of a non-compact state space: (1) when the potential function is bounded above, not bounded below and the Markov kernel is not ergodic; and (2) when the potential function is not bounded above, but the Markov kernel itself satisfies a multiplicative drift condition. © 2011 Elsevier B.V. All rights reserved.

AB - This article establishes sufficient conditions for a linear-in-time bound on the non-asymptotic variance for particle approximations of time-homogeneous Feynman-Kac formulae. These formulae appear in a wide variety of applications including option pricing in finance and risk sensitive control in engineering. In direct Monte Carlo approximation of these formulae, the non-asymptotic variance typically increases at an exponential rate in the time parameter. It is shown that a linear bound holds when a non-negative kernel, defined by the logarithmic potential function and Markov kernel which specify the Feynman-Kac model, satisfies a type of multiplicative drift condition and other regularity assumptions. Examples illustrate that these conditions are general and flexible enough to accommodate two rather extreme cases, which can occur in the context of a non-compact state space: (1) when the potential function is bounded above, not bounded below and the Markov kernel is not ergodic; and (2) when the potential function is not bounded above, but the Markov kernel itself satisfies a multiplicative drift condition. © 2011 Elsevier B.V. All rights reserved.

UR - https://linkinghub.elsevier.com/retrieve/pii/S0304414912000245

UR - http://www.scopus.com/inward/record.url?scp=84858712218&partnerID=8YFLogxK

U2 - 10.1016/j.spa.2012.02.002

DO - 10.1016/j.spa.2012.02.002

M3 - Article

SN - 0304-4149

VL - 122

JO - Stochastic Processes and their Applications

JF - Stochastic Processes and their Applications

IS - 4

ER -