Moment and Memory Properties of Linear Conditional Heteroscedasticity Models, and a New Model
线性条件异方差模型的矩与记忆性质及一种新模型AI 解读 ↓
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线性条件异方差模型的矩与记忆性质及一种新模型AI 解读 ↓
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conditional heteroscedasticity models in which the conditional variance is a linear function of squared lags of the process. GARCH, IGARCH, FIGARCH, and a newly proposed generalization, the HYGARCH model, belong to this class. Conditions are derived for the existence of second and fourth moments, and for the limited memory condition of near-epoch dependence. The HYGARCH model is applied to 10 daily dollar exchange rates, and also to data for Asian exchange rates over the 1997 crisis period. In the latter case, the model exhibits notable stability across the pre-crisis and post-crisis periods.