LARGE GLOBAL VOLATILITY MATRIX ANALYSIS BASED ON OBSERVATION STRUCTURAL INFORMATION
利用观测结构信息估计全球金融市场的大规模波动矩阵AI 解读 ↓
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利用观测结构信息估计全球金融市场的大规模波动矩阵AI 解读 ↓
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In this article, we develop a novel large volatility matrix estimation procedure for analyzing global financial markets. Practitioners often use lower-frequency data, such as weekly or monthly returns, to address the issue of different trading hours in the international financial market. However, this approach can lead to inefficiency due to information loss. To mitigate this problem, our proposed method, called Structured Principal Orthogonal complEment Thresholding (S-POET), incorporates observation structural information for both global and national factor models. We establish the asymptotic properties of the S-POET estimator, and also demonstrate the drawbacks of conventional covariance matrix estimation procedures when using lower-frequency data. Finally, we apply the S-POET estimator to an out-of-sample portfolio allocation study using international stock market data.