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A survey on theoretical advances of community detection in networks

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Real‐world networks usually have community structure, that is, nodes are grouped into densely connected communities. Community detection is one of the most popular and best‐studied research topics in network science and has attracted attention in many different fields, including computer science, statistics, social sciences, among others. Numerous approaches for community detection have been proposed in literature, from ad hoc algorithms to systematic model‐based approaches. The large number of available methods leads to a fundamental question: whether a certain method can provide consistent estimates of community labels. The stochastic blockmodel (SBM) and its variants provide a convenient framework for the study of such problems. This article is a survey on the recent theoretical advances of community detection. The authors review a number of community detection methods and their theoretical properties, including graph cut methods, profile likelihoods, the pseudo‐likelihood method, the variational method, belief propagation, spectral clustering, and semidefinite relaxations of the SBM. The authors also briefly discuss other research topics in community detection such as robust community detection, community detection with nodal covariates and model selection, as well as suggest a few possible directions for future research. WIREs Comput Stat 2017, 9:e1403. doi: 10.1002/wics.1403 This article is categorized under: Data: Types and Structure > Graph and Network Data

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