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Total Variation Approximation for Quasi-Stationary Distributions

Published online by Cambridge University Press:  14 July 2016

A. D. Barbour*
Affiliation:
Universität Zürich
P. K. Pollett*
Affiliation:
University of Queensland
*
∗ Postal address: Angewandte Mathematik, Universität Zürich, Winterthurertrasse 190, CH-8057 Zürich, Switzerland. Email address: a.d.barbour@math.uzh.ch
∗∗ Postal address: Department of Mathematics, University of Queensland, Brisbane, QLD 4072, Australia.
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Abstract

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Quasi-stationary distributions, as discussed in Darroch and Seneta (1965), have been used in biology to describe the steady state behaviour of population models which, while eventually certain to become extinct, nevertheless maintain an apparent stochastic equilibrium for long periods. These distributions have some drawbacks: they need not exist, nor be unique, and their calculation can present problems. In this paper, we give biologically plausible conditions under which the quasi-stationary distribution is unique, and can be closely approximated by distributions that are simple to compute.

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Type
Research Article
Copyright
Copyright © Applied Probability Trust 2010