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Stationarity and ergodicity of vector STAR models

Igor Kheifets and Pentti Saikkonen ()

Econometric Reviews, 2020, vol. 39, issue 4, 407-414

Abstract: Smooth transition autoregressive models are widely used to capture nonlinearities in univariate and multivariate time series. Existence of stationary solution is typically assumed, implicitly or explicitly. In this paper, we describe conditions for stationarity and ergodicity of vector STAR models. The key condition is that the joint spectral radius of certain matrices is below 1. It is not sufficient to assume that separate spectral radii are below 1. Our result allows to use recently introduced toolboxes from computational mathematics to verify the stationarity and ergodicity of vector STAR models.

Date: 2020
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DOI: 10.1080/07474938.2019.1651489

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