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Ergodicity, mixing, and existence of moments of a class of Markov models with applications to GARCH and ACD models

  • Mika Meitz
  • Pentti Saikkonen

This paper studies a class of Markov models which consist of two components. Typically, one of the components is observable and the other is unobservable or `hidden`. Conditions under which geometric ergodicity of the unobservable component is inherited by the joint process formed of the two components are given. This implies existence of initial values such that the joint process is strictly stationary and �-mixing. In addition to this, conditions for the existence of moments are also obtained and extensions to the case of nonstationary initial values are provided. All these results are applied to a general model which includes as special cases various first order generalized autoregressive conditional heteroskedasticity (GARCH) and autoregressive conditional duration (ACD) models with possibly complicated non-linear structures. The results only require mild moment assumptions and in some cases provide necessary and sufficient conditions for geometric ergodicity.

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File URL: http://www.economics.ox.ac.uk/materials/working_papers/paper327.pdf
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Paper provided by University of Oxford, Department of Economics in its series Economics Series Working Papers with number 327.

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Date of creation: 01 May 2007
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Handle: RePEc:oxf:wpaper:327
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