Magnitude and sign correlations in heartbeat fluctuations
Magnitude and sign correlations in heartbeat fluctuations
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DOI：
10.1103/physrevlett.86.1900
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发表时间：
2001-02-26
影响因子：
8.6
通讯作者：
Stanley, HE
中科院分区：
文献类型：
--
作者：
Ashkenazy, Y;Ivanov, PC;Stanley, HE
提出了一种分析长程相关信号的方法，将信号增量序列分解为幅度序列和符号序列，并分析它们的标度特性。我们发现，具有相同的长程相关性的信号可以表现出不同的时间组织的幅度和符号。我们发现，幅度序列与原始时间序列的非线性性质有关，而符号序列与线性性质有关。我们将我们的方法应用于心跳间隔序列，发现幅度序列是长程相关的，而符号序列是负相关的，幅度和符号序列都可能具有临床应用。
We propose an approach for analyzing signals with long-range correlations by decomposing the signal increment series into magnitude and sign series and analyzing their scaling properties. We show that signals with identical long-range correlations can exhibit different time organization for the magnitude and sign. We find that the magnitude series relates to the nonlinear properties of the original time series, while the sign series relates to the linear properties. We apply our approach to the heartbeat interval series and find that the magnitude series is long-range correlated, while the sign series is anticorrelated and that both magnitude and sign series may have clinical applications.