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Asymptotic expansions in multidimensional Markov renewal theory and first passage times for Markov random walks

Published online by Cambridge University Press:  01 July 2016

Cheng-Der Fuh*
Affiliation:
Academia Sinica
Tze Leung Lai*
Affiliation:
Stanford University
*
Postal address: Institute of Statistical Science, Academia Sinica, Taipei 11529, Taiwan, ROC.
∗∗ Postal address: Department of Statistics, Sequoia Hall, Stanford University, Stanford, CA 94305-4065, USA. Email address: lait@stat.stanford.edu

Abstract

We prove a d-dimensional renewal theorem, with an estimate on the rate of convergence, for Markov random walks. This result is applied to a variety of boundary crossing problems for a Markov random walk (Xn,Sn), n ≥0, in which Xn takes values in a general state space and Sn takes values in ℝd. In particular, for the case d = 1, we use this result to derive an asymptotic formula for the variance of the first passage time when Sn exceeds a high threshold b, generalizing Smith's classical formula in the case of i.i.d. positive increments for Sn. For d > 1, we apply this result to derive an asymptotic expansion of the distribution of (XT,ST), where T = inf { n : Sn,1 > b } and Sn,1 denotes the first component of Sn.

Type
General Applied Probability
Copyright
Copyright © Applied Probability Trust 2001 

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