Temporal Aggregation of Garch Processes
GARCH 过程的时间聚合AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要直接讨论 ARMA 过程的时间聚合与 GARCH 条件方差,对应时间序列和波动率;日度示例不足以支持日内高频分类。
GARCH 过程的时间聚合AI 解读 ↓
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The authors derive low frequency, say weekly, models implied by high frequency, say daily, ARMA models with symmetric GARCH errors. They show that low frequency models exhibit conditional heteroskedasticity of the GARCH form as well. The parameters in the conditional variance equation of the low frequency model depend upon mean, variance, and kurtosis parameters of the corresponding high frequency model. Moreover, strongly consistent estimators of the parameters in the high frequency model can be derived from low frequency data. The common assumption in applications that rescaled innovations are independent is disputable, since it depends upon the available data frequency. Copyright 1993 by The Econometric Society.
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