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Directional Variance Adjustment: Bias Reduction in Covariance Matrices Based on Factor Analysis with an Application to Portfolio Optimization

机译:方向方差调整:基于因子分析的协方差矩阵偏差减少及其在证券投资组合优化中的应用

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摘要

Robust and reliable covariance estimates play a decisive role in financial and many other applications. An important class of estimators is based on factor models. Here, we show by extensive Monte Carlo simulations that covariance matrices derived from the statistical Factor Analysis model exhibit a systematic error, which is similar to the well-known systematic error of the spectrum of the sample covariance matrix. Moreover, we introduce the Directional Variance Adjustment (DVA) algorithm, which diminishes the systematic error. In a thorough empirical study for the US, European, and Hong Kong stock market we show that our proposed method leads to improved portfolio allocation.
机译:稳健而可靠的协方差估计在财务和许多其他应用中起着决定性的作用。一类重要的估计量是基于因子模型的。在这里,我们通过广泛的蒙特卡洛模拟显示,从统计因子分析模型得出的协方差矩阵表现出系统误差,这类似于样本协方差矩阵的光谱的众所周知的系统误差。此外,我们引入了方向方差调整(DVA)算法,可减少系统误差。在针对美国,欧洲和香港股票市场的全面实证研究中,我们表明,我们提出的方法可以改善投资组合的分配。

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