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arXiv 2204.09097math.STstat.MEstat.TH
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加权网络社团结构检验的信息论极限

Information-theoretic Limits for Testing Community Structures in Weighted Networks

Mingao Yuan, Zuofeng Shang

摘要:

社区检测是指将网络中的节点聚类成组的问题。现有的社区结构推理方法主要集中在未加权(二进制)网络。然而,许多现实世界的网络是加权的,一个常见的做法是将加权网络二分为一个未加权的网络,这会导致信息丢失。关于后一种情况下的假设检验的文献仍然缺失。本文研究了加权网络中社团结构存在性的检验问题。我们的贡献有三个方面:(a)。我们使用(可能是无限维的)指数族来模拟权重,并推导出相合检验存在的尖锐的信息论极限。在此限度内,任何检验都是不一致的;超出此限度,我们提出了一种有用的相合检验。(b).基于信息理论的限制,我们提供了第一个正式的方式来量化的信息的损失二分法加权图到未加权图的背景下,假设检验。(c).我们提出了几个新的和实际有用的检验统计量。仿真研究表明,所提出的测试具有良好的性能。最后,我们将所提出的测试应用于动物社交网络。

英文摘要:

Community detection refers to the problem of clustering the nodes of a network into groups. Existing inferential methods for community structure mainly focus on unweighted (binary) networks. Many real-world networks are nonetheless weighted and a common practice is to dichotomize a weighted network to an unweighted one which is known to result in information loss. Literature on hypothesis testing in the latter situation is still missing. In this paper, we study the problem of testing the existence of community structure in weighted networks. Our contributions are threefold: (a). We use the (possibly infinite-dimensional) exponential family to model the weights and derive the sharp information-theoretic limit for the existence of consistent test. Within the limit, any test is inconsistent; and beyond the limit, we propose a useful consistent test. (b). Based on the information-theoretic limits, we provide the first formal way to quantify the loss of information incurred by dichotomizing weighted graphs into unweighted graphs in the context of hypothesis testing. (c). We propose several new and practically useful test statistics. Simulation study show that the proposed tests have good performance. Finally, we apply the proposed tests to an animal social network.

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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