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arXiv 1410.0761stat.ME
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相关网络中的变点检测

Change Point Detection in Correlation Networks

Ian Barnett, Jukka-Pekka Onnela

摘要:

许多由相互作用的元素组成的系统可以被概念化为网络,其中网络节点代表元素,网络纽带代表元素之间的相互作用。在底层网络随时间演变的系统中,确定网络结构显著变化的时间点是有用的,因为这些时间点也可能对应于功能变化点。我们提出了一种方法来检测这些变化点的相关网络,不同于以前的变化点检测方法设计的时间序列数据,不需要分布假设。我们研究了相关网络中数据边界附近的变点检测的困难,并通过仿真证明了我们的方法和竞争方法的强大功能。我们还显示了我们的方法的可推广性,将其应用到股票价格数据以及fMRI数据。

英文摘要:

Many systems of interacting elements can be conceptualized as networks, where network nodes represent the elements and network ties represent interactions between the elements. In systems where the underlying network evolves in time, it is useful to determine the points in time where the network structure changes significantly as these may correspond also to functional change points. We propose a method for detecting these change points in correlation networks that, unlike previous change point detection methods designed for time series data, requires no distributional assumptions. We investigate the difficulty of change point detection near the boundaries of data in correlation networks and demonstrate the power of our method and a competing method through simulation. We also show the generalizable nature of our method by applying it to stock price data as well as fMRI data.

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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