Ubiquitousness of link-density and link-pattern communities in real-world networks
University of Ljubljana, Faculty of Computer and Information
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Received in final form: 24 October 2011
Published online: 18 January 2012
Community structure appears to be an intrinsic property of many complex real-world networks. However, recent work shows that real-world networks reveal even more sophisticated modules than classical cohesive (link-density) communities. In particular, networks can also be naturally partitioned according to similar patterns of connectedness among the nodes, revealing link-pattern communities. We here propose a propagation based algorithm that can extract both link-density and link-pattern communities, without any prior knowledge of the true structure. The algorithm was first validated on different classes of synthetic benchmark networks with community structure, and also on random networks. We have further applied the algorithm to different social, information, technological and biological networks, where it indeed reveals meaningful (composites of) link-density and link-pattern communities. The results thus seem to imply that, similarly as link-density counterparts, link-pattern communities appear ubiquitous in nature and design.
Key words: Interdisciplinary Physics
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012