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arXiv 1908.01823stat.MEmath.STstat.TH
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基于图子估计的动态网络变点检测

Change-point detection in dynamic networks via graphon estimation

Zifeng Zhao, Li Chen, Lizhen Lin

摘要:

我们提出了一种通用的方法在动态网络中的变点检测。所提出的方法是无模型的,并涵盖了广泛的动态网络。我们的方法背后的关键思想是有效地利用网络结构设计变点检测算法。这是通过图子估计的初始步骤来完成的,在这里我们提出了一个改进的邻域平滑算法来估计动态网络的链路概率矩阵。在初始图子估计的基础上,提出了一种动态网络多变点检测的筛选和阈值算法。的收敛速度和一致性的变化点检测过程中,以及MMBS。当节点的数量很大时~(例如,超过时间点的数量),我们的方法产生更快的收敛速度,在检测变化点相比,简单地采用平均信息的动态网络在整个时间的算法。数值实验表明,所提出的算法的鲁棒性能的变化点检测在各种类型的动态网络,并观察到优于现有的方法。一个真实的数据例子来说明该程序的有效性和实际影响。

英文摘要:

We propose a general approach for change-point detection in dynamic networks. The proposed method is model-free and covers a wide range of dynamic networks. The key idea behind our approach is to effectively utilize the network structure in designing change-point detection algorithms. This is done via an initial step of graphon estimation, where we propose a modified neighborhood smoothing~(MNBS) algorithm for estimating the link probability matrices of a dynamic network. Based on the initial graphon estimation, we then develop a screening and thresholding algorithm for multiple change-point detection in dynamic networks. The convergence rate and consistency for the change-point detection procedure are derived as well as those for MNBS. When the number of nodes is large~(e.g., exceeds the number of temporal points), our approach yields a faster convergence rate in detecting change-points comparing with an algorithm that simply employs averaged information of the dynamic network across time. Numerical experiments demonstrate robust performance of the proposed algorithm for change-point detection under various types of dynamic networks, and superior performance over existing methods is observed. A real data example is provided to illustrate the effectiveness and practical impact of the procedure.

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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