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首页> 外文期刊>International journal of theoretical and applied finance >PORTFOLIO RETURN DISTRIBUTIONS: SAMPLE STATISTICS WITH STOCHASTIC CORRELATIONS
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PORTFOLIO RETURN DISTRIBUTIONS: SAMPLE STATISTICS WITH STOCHASTIC CORRELATIONS

机译:投资组合回报分布:具有随机相关性的样本统计

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We consider random vectors drawn from a multivariate normal distribution and compute the sample statistics in the presence of stochastic correlations. For this purpose, we construct an ensemble of random correlation matrices and average the normal distribution over this ensemble. The resulting distribution contains a modified Bessel function of the second kind whose behavior differs significantly from the multivariate normal distribution, in the central part as well as in the tails. This result is then applied to asset returns. We compare with empirical return distributions using daily data from the NASDAQ Composite Index in the period from 1992 to 2012. The comparison reveals good agreement, the average portfolio return distribution describes the data well especially in the central part of the distribution. This in turn confirms our ansatz to model the nonstationarity by an ensemble average.
机译:我们考虑从多元正态分布中得出的随机向量,并在存在随机相关性的情况下计算样本统计量。为此,我们构建了一个随机相关矩阵的集合,并对该集合的正态分布求平均。所得的分布在中央部分和尾部都包含第二种修正的Bessel函数,其行为与多元正态分布明显不同。然后将该结果应用于资产收益。我们使用1992年至2012年期间纳斯达克综合指数的每日数据与经验回报分布进行比较。该比较显示出良好的一致性,平均投资组合回报分布很好地描述了数据,尤其是在分布的中心部分。这反过来又证实了我们的ansatz可以通过整体平均值来模拟非平稳性。

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