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arXiv 0902.0678physics.data-anphysics.soc-ph
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随机噪声下幂律相关序列的去趋势波动分析

Detrended fluctuation analysis of power-law-correlated sequences with random noises

Shin-ichi Tadaki

摘要:

时间分辨率的提高有时会在时间数据序列中引入短程随机噪声。这些噪声影响功率谱分析和去趋势波动分析(DFA)的结果。DFA是分析非平稳序列长程相关性的有效方法之一。基于人工时间序列,讨论了噪声的影响。短距离的噪声使功率谱分析无法检测到长距离的相关性。DFA可以从噪声时间序列中提取长程相关性。DFA还给出了噪声占主导地位的阈值时间长度。对于实际分析,粗粒度的时间序列恢复长程相关性。

英文摘要:

Improvement in time resolution sometimes introduces short-range random noises into temporal data sequences. These noises affect the results of power-spectrum analyses and the Detrended Fluctuation Analysis (DFA). The DFA is one of useful methods for analyzing long-range correlations in non-stationary sequences. The effects of noises are discussed based on artificial temporal sequences. Short-range noises prevent power-spectrum analyses from detecting long-range correlations. The DFA can extract long-range correlations from noisy time sequences. The DFA also gives the threshold time length, under which the noises dominate. For practical analyses, coarse-grained time sequences are shown to recover long-range correlations.

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