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  • Rong Liu (a1) and Lijian Yang (a2)

The semiparametric GARCH (Generalized AutoRegressive Conditional Heteroskedasticity) model of Yang (2006, Journal of Econometrics 130, 365–384) has combined the flexibility of a nonparametric link function with the dependence on infinitely many past observations of the classic GARCH model. We propose a cubic spline procedure to estimate the unknown quantities in the semiparametric GARCH model that is intuitively appealing due to its simplicity. The theoretical properties of the procedure are the same as the kernel procedure, while simulated and real data examples show that the numerical performance is either better than or comparable to the kernel method. The new method is computationally much more efficient than the kernel method and very useful for analyzing large financial time series data.

Corresponding author
*Address correspondence to Lijian Yang, Center for Advanced Statistics and Econometrics Research, Soochow University, Suzhou 215006, China; e-mail:
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Econometric Theory
  • ISSN: 0266-4666
  • EISSN: 1469-4360
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