State‐space Models with Finite Dimensional Dependence

Christian Gourieroux and Joann Jasiak

Journal of Time Series Analysis, 2001, vol. 22, issue 6, 665-678

Abstract: We consider nonlinear state‐space models, where the state variable (ζt) is Markov, stationary and features finite dimensional dependence (FDD), i.e. admits a transition function of the type: π(ζt|ζt−1) =π(ζt)a′(ζt)b(ζt−1), where π(ζt) denotes the marginal distribution of ζt, with a finite number of cross‐effects between the present and past values. We discuss various characterizations of the FDD condition in terms of the predictor space and nonlinear canonical decomposition. The FDD models are shown to admit explicit recursive formulas for filtering and smoothing of the observable process, that arise as an extension of the Kitagawa approach. The filtering and smoothing algorithms are given in the paper. JEL. C4.

Date: 2001
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