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arXiv 1206.1007physics.data-anq-fin.GN
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长记忆相关短序列数据去趋势波动分析的标度范围

On the scaling ranges of detrended fluctuation analysis for long-memory correlated short series of data

Dariusz Grech, Zygmunt Mazur

摘要:

我们研究的去趋势波动分析(DFA)的标度制度-最流行的方法来检测存在的长记忆数据和时间序列的分形结构。首先,在不同的置信水平下,研究了不相关数据的DFA的标度范围作为时间序列长度$L$和回归线系数$R^2$的函数。接下来,进行具有长记忆的人工短序列的分析。在这两种情况下,发现缩放范围$λ$都线性变化--都与$L$和$R^2$有关。我们展示了如何将这种依赖关系推广到一个简单的统一模型,描述$λ=λ(L, R^2, H)$的关系$H$($1/2\leq H \leq 1$)代表的赫斯特指数的远程自相关数据。我们的研究结果应该是有用的DFA技术的所有应用程序,特别是瞬时(本地)DFA,其中大量的短时间序列必须一次检查,没有可能的初步检查每个系列的标度范围分别。

英文摘要:

We examine the scaling regime for the detrended fluctuation analysis (DFA) - the most popular method used to detect the presence of long memory in data and the fractal structure of time series. First, the scaling range for DFA is studied for uncorrelated data as a function of length $L$ of time series and regression line coefficient $R^2$ at various confidence levels. Next, an analysis of artificial short series with long memory is performed. In both cases the scaling range $λ$ is found to change linearly -- both with $L$ and $R^2$. We show how this dependence can be generalized to a simple unified model describing the relation $λ=λ(L, R^2, H)$ where $H$ ($1/2\leq H \leq 1$) stands for the Hurst exponent of long range autocorrelated data. Our findings should be useful in all applications of DFA technique, particularly for instantaneous (local) DFA where enormous number of short time series has to be examined at once, without possibility for preliminary check of the scaling range of each series separately.

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