title: Community detection algorithms: a comparative analysis.
abstract: Uncovering the community structure exhibited by real networks is a crucial step toward an understanding of complex systems that goes beyond the local organization of their constituents. Many algorithms have been proposed so far, but none of them has been subjected to strict tests to evaluate their performance. Most of the sporadic tests performed so far involved small networks with known community structure and/or artificial graphs with a simplified structure, which is very uncommon in real systems. Here we test several methods against a recently introduced class of benchmark graphs, with heterogeneous distributions of degree and community size. The methods are also tested against the benchmark by Girvan and Newman [Proc. Natl. Acad. Sci. U.S.A. 99, 7821 (2002)] and on random graphs. As a result of our analysis, three recent algorithms introduced by Rosvall and Bergstrom [Proc. Natl. Acad. Sci. U.S.A. 104, 7327 (2007); Proc. Natl. Acad. Sci. U.S.A. 105, 1118 (2008)], Blondel [J. Stat. Mech.: Theory Exp. (2008), P10008], and Ronhovde and Nussinov [Phys. Rev. E 80, 016109 (2009)] have an excellent performance, with the additional advantage of low computational complexity, which enables one to analyze large systems.
authors.affiliation: Complex Networks and Systems, Institute for Scientific Interchange, Viale S. Severo 65, 10133 Torino, Italy.
authors.forename: Andrea
authors.initials: A
authors.lastname: Lancichinetti
authors.forename: Santo
authors.initials: S
authors.lastname: Fortunato
mesh_terms: D000465:Algorithms; D001703:Biophysics / Q000379:methods; D016000:Cluster Analysis; D019058:Community Networks; D008954:Models, Biological; D015233:Models, Statistical; D008962:Models, Theoretical; D016571:Neural Networks, Computer