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arXiv 1102.4076q-fin.ST
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随机相关矩阵谱性质的精细结构:在金融市场中的应用

The fine structure of spectral properties for random correlation matrices: an application to financial markets

G. Livan, S. Alfarano, E. Scalas

摘要:

研究了金融相关矩阵特征值谱的一些性质。特别是,我们调查的性质的大的特征值块观察到的经验,这往往被认为是一个后果,所谓的大量的噪音包含在金融数据。我们挑战这一常识,采取行动的经验相关矩阵的两个数据集的过滤程序,突出了一些集群结构,它们包含,我们分析的后果,这样的过滤特征值谱。我们表明,经验观察到的特征值块出现的叠加较小的结构,这反过来又出现股票之间的交叉相关性的结果。我们解释和证实这些研究结果的因子模型,我们比较经验谱的随机矩阵理论预测这样的模型。

英文摘要:

We study some properties of eigenvalue spectra of financial correlation matrices. In particular, we investigate the nature of the large eigenvalue bulks which are observed empirically, and which have often been regarded as a consequence of the supposedly large amount of noise contained in financial data. We challenge this common knowledge by acting on the empirical correlation matrices of two data sets with a filtering procedure which highlights some of the cluster structure they contain, and we analyze the consequences of such filtering on eigenvalue spectra. We show that empirically observed eigenvalue bulks emerge as superpositions of smaller structures, which in turn emerge as a consequence of cross-correlations between stocks. We interpret and corroborate these findings in terms of factor models, and and we compare empirical spectra to those predicted by Random Matrix Theory for such models.

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