A coupled component DCS-EGARCH model for intraday and overnight volatility
日内与隔夜波动率的耦合成分 DCS-EGARCH 模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要的核心是日内与隔夜收益的波动率建模、动态估计及股票应用。
日内与隔夜波动率的耦合成分 DCS-EGARCH 模型AI 解读 ↓
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We propose a semi-parametric coupled component exponential GARCH model for intraday and overnight returns that allows the two series to have different dynamical properties. We adopt a dynamic conditional score model with t-distributed innovations that captures the very heavy tails of overnight returns. We propose a several-step estimation procedure that captures the nonparametric slowly moving components by kernel estimation and the dynamic parameters by maximum likelihood. We establish the consistency, asymptotic normality, and semiparametric efficiency of our semiparametric estimation procedures. We extend the modelling to the multivariate case where we allow time varying correlation between stocks. We apply our model to the study of Dow Jones industrial average component stocks and CRSP size-based portfolios over the period 1993–2017. We show that the ratio of overnight to intraday volatility has actually increased in importance for Dow Jones stocks during the last two decades. This ratio has also increased for large stocks in the CRSP database, but decreased for small stocks in CRSP.