***** To join INSNA, visit http://www.insna.org ***** Hi- THanks. I pretty mush said that. But the (darn their curiosity!) student wanted to know WHY the negative results appear. J On Mon, Sep 28, 2015 at 3:43 PM, Vincenzo Nicosia <[log in to unmask]> wrote: > On Mon, Sep 28, 2015 at 03:21:31PM -0400, Jordi Comas wrote: > > [cut] > > > So, can someone help me out? To my eyes, the Bonacich algoritihim > sums up > > the centrality score of each node by weighting each node. How can and > > additive series get a negative score? > > Thanks! > > Jordi > > (cookies in the mail for you for good answer. :) ) > > The problem is that if \beta is larger than the inverse of the largest > eigenvalue of the adjancency matrix, the sum which defines the > centrality scores does not converge any more. One of the practical > consequences is that the negative values will appear here and there in > your eigenvector, but the basic message is that the results you get > for your centrality scores loose any meaning. > > My2Cents > > Enzo > > -- > [ Enzo Nicosia - School of Mathematical Sciences - Queen Mary UL ] > [ -- v.nicosia [at] qmul.ac.uk -- katolaz [at] yahoo [dot] it -- ] > [ -- web @QMUL: http://maths.qmul.ac.uk/~vnicosia/index.html -- ] > [ twitter:@KatolaZ -- jabber:[log in to unmask] - skype: katolaz ] > -- *Jordi Comas* *"There is nothing so practical as a good theory." Kurt Lewin* Social Innovation and Entrepreneurship Blog (under construction): Simple Tools. <https://simpletools.blogs.bucknell.edu/> Netcentric <http://netcentric.blogs.bucknell.edu/>: Resources for Teaching Network Theory and Research Research and Writing Blog: Nets We Weave <http://netsweweave.wordpress.com> *Assistant ProfessorSchool of ManagementBucknell UniversityTaylor 112570 577 3161* _____________________________________________________________________ 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.