New HEAVY Models for Fat-Tailed Realized Covariances and Returns
适用于厚尾已实现协方差与收益的新 HEAVY 模型AI 解读 ↓
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AI 根据所提供的论文材料归类:摘要以日股票收益和已实现协方差的联合动态为对象,核心是潜在协方差滤波与多元波动率建模,因此选择波动率方向。
适用于厚尾已实现协方差与收益的新 HEAVY 模型AI 解读 ↓
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We develop a new score-driven model for the joint dynamics of fat-tailed realized covariance matrix observations and daily returns. The score dynamics for the unobserved true covariance matrix are robust to outliers and incidental large observations in both types of data by assuming a matrix-F distribution for the realized covariance measures and a multivariate Student's t distribution for the daily returns. The filter for the unknown covariance matrix has a computationally efficient matrix formulation, which proves beneficial for estimation and simulation purposes. We formulate parameter restrictions for stationarity and positive definiteness. Our simulation study shows that the new model is able to deal with high-dimensional settings (50 or more) and captures unobserved volatility dynamics even if the model is misspecified. We provide an empirical application to daily equity returns and realized covariance matrices up to 30 dimensions. The model statistically and economically outperforms competing multivariate volatility models out-of-sample. Supplementary materials for this article are available online.