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arXiv 0908.1089q-fin.STphysics.data-an
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金融收益的经验多重分形成分

The components of empirical multifractality in financial returns

Wei-Xing Zhou

摘要:

本文以1896年5月26日至2007年4月27日道琼斯工业平均指数的日数据为例,对金融收益率的经验多重分形的组成部分进行了系统的研究。收益率的时间结构和厚尾分布被认为是可能的影响因素。将原始收益率序列的多重分形谱与四种替代数据的多重分形谱进行了比较:(1)不包含时间相关性但具有相同分布的混洗数据,(2)其中任何非线性相关性被去除但分布和线性相关性被保留的替代数据,(3)其中大的正收益和负收益被小的值替换的替代数据,以及(4)从保留时间相关性的可选厚尾分布生成的替代数据。我们发现这些因素都对多重分形谱有影响。我们还发现,时间结构(线性或非线性)对多重分形谱的奇异宽度$Δα$的影响较小,而胖尾对$Δα$的影响较大,这证实了先前的结果.此外,线性相关被发现只有水平平移的多重分形谱的距离约等于其DFA标度指数和0.5之间的差异的影响。我们的方法也可以应用到其他金融或物理变量和其他多重分形形式主义。

英文摘要:

We perform a systematic investigation on the components of the empirical multifractality of financial returns using the daily data of Dow Jones Industrial Average from 26 May 1896 to 27 April 2007 as an example. The temporal structure and fat-tailed distribution of the returns are considered as possible influence factors. The multifractal spectrum of the original return series is compared with those of four kinds of surrogate data: (1) shuffled data that contain no temporal correlation but have the same distribution, (2) surrogate data in which any nonlinear correlation is removed but the distribution and linear correlation are preserved, (3) surrogate data in which large positive and negative returns are replaced with small values, and (4) surrogate data generated from alternative fat-tailed distributions with the temporal correlation preserved. We find that all these factors have influence on the multifractal spectrum. We also find that the temporal structure (linear or nonlinear) has minor impact on the singularity width $Δα$ of the multifractal spectrum while the fat tails have major impact on $Δα$, which confirms the earlier results. In addition, the linear correlation is found to have only a horizontal translation effect on the multifractal spectrum in which the distance is approximately equal to the difference between its DFA scaling exponent and 0.5. Our method can also be applied to other financial or physical variables and other multifractal formalisms.

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