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arXiv 1003.2539q-fin.STphysics.data-an
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金融时间序列的多尺度自相似行为与非统计特性

Characterizing Multi-Scale Self-Similar Behavior and Non-Statistical Properties of Financial Time Series

Sayantan Ghosh, P. Manimaran, Prasanta K. Panigrahi

摘要:

本文利用小波变换研究了不同经济部门的大公司股票价格的多尺度、自相似行为及其偏差。股票市场收益率具有多重分形特征,部分公司在小尺度和大尺度上表现出偏离。事实上,小波属于Daubechies'(Db)的基础,使人们能够隔离不同程度的局部多项式趋势,在隔离不同尺度的波动起着关键作用。这项工作的主要动机之一是研究$k^{-3}$行为的出现\cite{hes5}的波动开始与高频波动。为了研究这些金融时间序列的统计特征,我们分别利用Db 4和Db 6基组在不同尺度上分离出局部线性和二次趋势。波动揭示了肥尾非高斯行为,不稳定的周期性调制,在更精细的尺度,从特征$k^{-3}$幂律行为出现在足够大的尺度。我们进一步确定稳定的周期性行为,通过连续Morlet小波。

英文摘要:

We make use of wavelet transform to study the multi-scale, self similar behavior and deviations thereof, in the stock prices of large companies, belonging to different economic sectors. The stock market returns exhibit multi-fractal characteristics, with some of the companies showing deviations at small and large scales. The fact that, the wavelets belonging to the Daubechies' (Db) basis enables one to isolate local polynomial trends of different degrees, plays the key role in isolating fluctuations at different scales. One of the primary motivations of this work is to study the emergence of the $k^{-3}$ behavior \cite{hes5} of the fluctuations starting with high frequency fluctuations. We make use of Db4 and Db6 basis sets to respectively isolate local linear and quadratic trends at different scales in order to study the statistical characteristics of these financial time series. The fluctuations reveal fat tail non-Gaussian behavior, unstable periodic modulations, at finer scales, from which the characteristic $k^{-3}$ power law behavior emerges at sufficiently large scales. We further identify stable periodic behavior through the continuous Morlet wavelet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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