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***** To join INSNA, visit http://www.insna.org ***** > >Colleagues, I'm looking for a program to conduct a triads analysis. Any >recommendations? >Thanks >Wayne Baker There is the "motif finder" program that Milo et al. used in their two provocative papers in Science. The motif finder will do triadic census, as well as look for all four-node formations. It is relatively straightforward to use. The programs can be downloaded from: http://www.weizmann.ac.il/mcb/UriAlon/ The papers are: 1. Milo R, Shen-Orr S, Itzkovitz S, Kashtan N, Chklovskii D, Alon U. Network Motifs: Simple Building Blocks of Complex Networks. Science. 2002;298:824-827. 2. Milo R, Itzkovitz S, Kashtan N, et al. Superfamilies of Evolved and Designed Networks. Science. 2004;303:1538-1542. The cleverness of these papers comes from their use of simulated ensembles of networks of the same connectivity as the observed network. But I haven't been able to convince myself as to what general classes of questions this ensemble approach provides the "right" null hypothesis, as opposed to simpler triadic census approaches. I'd welcome advice. best, Jack -- -=-=-=-=-=-=-=-=-=-=-=-=-=- Theodore J. Iwashyna, M.D., Ph.D. Division of Pulmonary and Critical Care Department of Medicine Hospital of the University of Pennsylvania email: [log in to unmask] -=-=-=-=-=-=-=-=-=-=-=-=-=- _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.insna.org). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.