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Varying Coefficient GARCH Models

In: Handbook of Financial Time Series

Author

Listed:
  • Pavel Čížek

    (Tilburg University, Department of Econometrics & OR)

  • Vladimir Spokoiny

    (Weierstrass–Institute)

Abstract

This paper offers a new method for estimation and forecasting of the volatility of financial time series when the stationarity assumption is violated. We consider varying–coefficient parametric models, such as ARCH and GARCH, whose coefficients may arbitrarily vary with time. This includes global parametric, smooth transition, and change–point models as special cases. The method is based on an adaptive pointwise selection of the largest interval of homogeneity with a given right–end point, which is obtained by a local change–point analysis.We construct locally adaptive volatility estimates that can perform this task and investigate them both from the theoretical point of view and by Monte Carlo simulations. Additionally, the proposed method is applied to stock–index series and shown to outperform the standard parametric GARCH model.

Suggested Citation

  • Pavel Čížek & Vladimir Spokoiny, 2009. "Varying Coefficient GARCH Models," Springer Books, in: Thomas Mikosch & Jens-Peter Kreiß & Richard A. Davis & Torben Gustav Andersen (ed.), Handbook of Financial Time Series, chapter 7, pages 169-185, Springer.
    • Handle: RePEc:spr:sprchp:978-3-540-71297-8_7
    DOI: 10.1007/978-3-540-71297-8_7
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