Forecasting Conditional Covariance Matrices in High-Dimensional Time Series: A General Dynamic Factor Approach
高维时间序列条件协方差矩阵预测:广义动态因子方法AI 解读 ↓
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高维时间序列条件协方差矩阵预测:广义动态因子方法AI 解读 ↓
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Based on a General Dynamic Factor Model with infinite-dimensional factor space and MGARCH volatility models, we develop new estimation and forecasting procedures for conditional covariance matrices in high-dimensional time series. The finite-sample performance of our approach is evaluated via Monte Carlo experiments and outperforms the most alternative methods. This new approach is also used to construct minimum one-step-ahead variance portfolios for a high-dimensional panel of assets. The results are shown to match the results of recent proposals by Engle, Ledoit, and Wolf and achieve better out-of-sample portfolio performance than alternative procedures proposed in the literature.