***** To join INSNA, visit http://www.insna.org ***** The concept you're talking about is often called "structural equivalence". Since I gather you have a copy of my book, you can read about it in Section 7.12, although there are a number of excellent texts available on social network analysis that also offer good discussions. Mark On 03/28/2011 07:43 AM, John McCreery wrote: > ***** To join INSNA, visit http://www.insna.org ***** I am reading > M.E.H.Newman's /Networks: An Introduction/ and have reached page 114 > where the author defined cocitation for directed networks: "The > /cocitation/ of two vertices/ i/ and /j/ in a directed network is the > number of vertices that have outgoing edges pointing to both /i/ and > /j/." I am wondering if anyone has done research using an analogous > measure for undirected networks. > > I wonder if we might learn something important about ties between teams > if we were able to measure the number of vertices (= team members) with > edges linking them to both /i/ and /j /even if /i/ and /j /are not > linked to each other. > > I ask because, to me at least, an interesting problem in working with > networks connecting individual members of teams is that teams, by > definition, are cliques, which means that every member of a team is, > ipso facto, linked to every other. But, at least in the advertising > business from which my data come, team members to do always work with > each other. An individual may belong to more than one team. Thus, at one > extreme, a team may be composed of people who have never worked together > before or, at the other extreme, people who always work together, with > every possible variation in between. Being able to identify and measure > what we might call /co-comember /connections might lead to interesting > results. > > Any and all comments and suggestions are welcome. > > John McCreery > The Word Works, Ltd., Yokohama, JAPAN > Tel. +81-45-314-9324 > [log in to unmask] <mailto:[log in to unmask]> > http://www.wordworks.jp/ > _____________________________________________________________________ > 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. _____________________________________________________________________ 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.