95854 20210902121618.0 doi 10.1088/1367-2630/ab687c sideral 116419 ART-2020-116419 eng Alves, Luiz GA Centrality anomalies in complex networks as a result of model over-simplification 2020 Access copy available to the general public Unrestricted Tremendous advances have been made in our understanding of the properties and evolution of complex networks. These advances were initially driven by information-poor empirical networks and theoretical analysis of unweighted and undirected graphs. Recently, information-rich empirical data complex networks supported the development of more sophisticated models that include edge directionality and weight properties, and multiple layers. Many studies still focus on unweighted undirected description of networks, prompting an essential question: how to identify when a model is simpler than it must be? Here, we argue that the presence of centrality anomalies in complex networks is a result of model over-simplification. Specifically, we investigate the well-known anomaly in betweenness centrality for transportation networks, according to which highly connected nodes are not necessarily the most central. Using a broad class of network models with weights and spatial constraints and four large data sets of transportation networks, we show that the unweighted projection of the structure of these networks can exhibit a significant fraction of anomalous nodes compared to a random null model. However, the weighted projection of these networks, compared with an appropriated null model, significantly reduces the fraction of anomalies observed, suggesting that centrality anomalies are a symptom of model over-simplification. Because lack of information-rich data is a common challenge when dealing with complex networks and can cause anomalies that misestimate the role of nodes in the system, we argue that sufficiently sophisticated models be used when anomalies are detected. info:eu-repo/grantAgreement/ES/DGA/E36-17R info:eu-repo/grantAgreement/ES/MINECO-FEDER/FIS2017-87519-P info:eu-repo/grantAgreement/ES/MINECO/FIS2014-55867 info:eu-repo/semantics/openAccess by http://creativecommons.org/licenses/by/3.0/es/ 3.729 2020 PHYSICS, MULTIDISCIPLINARY 22 / 85 = 0.259 2020 Q2 T1 1.584 2020 Physics and Astronomy (miscellaneous) 2020 Q1 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Aleta, Alberto (orcid)0000-0002-1192-8707 Rodrigues, FA Moreno, Yamir Universidad de Zaragoza (orcid)0000-0002-0895-1893 Nunes Amaral, Luis A. 2004 405 Universidad de Zaragoza Dpto. Física Teórica Área Física Teórica 22, 1 (2020), 013043 [12 pp] New j. phys. New Journal of Physics 1367-2630 1143037 http://zaguan.unizar.es/record/95854/files/texto_completo.pdf Versión publicada 102113 http://zaguan.unizar.es/record/95854/files/texto_completo.jpg?subformat=icon icon Versión publicada oai:zaguan.unizar.es:95854 articulos driver 2021-09-02-08:45:31 ARTICLE