Francq, Christian and Zakoian, JeanMichel (2021): Local asymptotic normality of general conditionally heteroskedastic and scoredriven timeseries models.

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Abstract
The paper establishes the Local Asymptotic Normality (LAN) property for general conditionally heteroskedastic time series models of multiplicative form, $\epsilon_t=\sigma_t(\btheta_0)\eta_t$, where the volatility $\sigma_t(\btheta_0)$ is a parametric function of $\{\epsilon_{s}, s< t\}$, and $(\eta_t)$ is a standardized i.i.d. noise endowed with a density $f_{\btheta_0}$. In contrast with earlier results, the finite dimensional parameter $\btheta_0$ enters in both the volatility and the density specifications. To deal with nondifferentiable functions, we introduce a conditional notion of the familiar quadratic mean differentiability condition which takes into account parameter variation in both the volatility and the errors density. Our results are illustrated on two particular models: the APARCH with Asymmetric Student$t$ distribution, and the Beta$t$GARCH model.
Item Type:  MPRA Paper 

Original Title:  Local asymptotic normality of general conditionally heteroskedastic and scoredriven timeseries models 
Language:  English 
Keywords:  APARCH; Asymmetric Student$t$ distribution; Beta$t$GARCH; Conditional heteroskedasticity; LAN in time series; Quadratic mean differentiability. 
Subjects:  C  Mathematical and Quantitative Methods > C5  Econometric Modeling > C51  Model Construction and Estimation 
Item ID:  106542 
Depositing User:  Christian Francq 
Date Deposited:  11 Mar 2021 08:37 
Last Modified:  11 Mar 2021 08:37 
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URI:  https://mpra.ub.unimuenchen.de/id/eprint/106542 