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Stability of nonlinear stochastic recursions with application to nonlinear AR-GARCH models

Published online by Cambridge University Press:  01 July 2016

Daren B. H. Cline*
Affiliation:
Texas A&M University
*
Postal address: Department of Statistics, Texas A&M University, College Station, TX 77843-3143, USA. Email address: [email protected]
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Abstract

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We characterize the Lyapunov exponent and ergodicity of nonlinear stochastic recursion models, including nonlinear AR-GARCH models, in terms of an easily defined, uniformly ergodic process. Properties of this latter process, known as the collapsed process, also determine the existence of moments for the stochastic recursion when it is stationary. As a result, both the stability of a given model and the existence of its moments may be evaluated with relative ease. The method of proof involves piggybacking a Foster-Lyapunov drift condition on certain characteristic behavior of the collapsed process.

Type
General Applied Probability
Copyright
Copyright © Applied Probability Trust 2007 

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