***** To join INSNA, visit http://www.insna.org ***** References: Sim, F. M. and Schwartz, M. R. 1979. /Does Concor Find Positions?/ Paper presented at the Annual Meeting of the Eastern Sociological Society, New York. Doreian, P. 1988. Using Multiple Network Analytic Tools for a Single Social Network. /Social Networks/, 10, pp. 287-312. Faust, K. 1988. Comparison of Methods for Positional Analysis: Structural and General Equivalences. /Social Networks/, 10(4), pp. 313-341. Schwartz, J. E. 1977. An Examination of CONCOR and Related Methods for Blocking Sociometric Data. /Sociological Methodology/, 8, pp. 255-282. Semenov Alexander wrote: > Thanks! > I have one more question - can you give me full citations of the > mentioned articles? I know only Doreian's article and can't identify > others. > Alexander. > > 2010/3/31 Carl Nordlund <[log in to unmask] > <mailto:[log in to unmask]>> > > Hi, > Even though the Concor algorithm can provide results that are > intuitive, there has been quite a lot of critique raised against > it (e.g. Sim and Schwartz 1979; Doreian 1988; Faust 1988). One of > its founders has explicitly said that there is "[no] justification > for advocating the iteration of [correlance coefficients] matrices > as a method for analysis of data" (Schwartz 1977:266ff). Tha > algorithm always produced 2 splits, and makes subsequent > partitions quite arbitrary when it comes to which of these splits > to split further. > > If there are strong arguments to use structural equivalence, > perhaps it would be better to simply use the correlance matrix > (distance-based or Pearson) and use MDS to plot these in two > dimensions, subsequently interpreting this in combination with a > dendrogram. Depending on the data, and what you are looking for, > you should also look into regular equivalence (if that specific > sociological notion of "roles" is applicable to your particular > study). > > I might be wrong, but it was quite some time since I last saw a > solid argument on the advantages of using the Concor algorithm. > > Yours, > Carl > > Semenov Alexander wrote: > > ***** To join INSNA, visit http://www.insna.org ***** > > I guess you have your data already clustered by CONCOR, and you > would like > to present the reduced blockmatrix by MDS? > > When I run MDS directly in NetMiner it draws me a map with > only a few visible actors. It seems like 90% of nodes are > exactly in the centre and one-two are at the end of each axis. > It's almost imposible to interpret such picture. But when I > check MDS as an output option in CONCOR, it shows me nice > scatter plot with 3 distinctive axis and some dispersion. This > picture corresponds with my substantive assumptions and very > interesting for interpretation. > > Anyhow, you will be much more exposed to criticism for adopting > CONCOR, than > for using MDS... > > Why? Unfortunatelly, I really doubt it =( Here in Russia there > is only one thesis on SNA and only one book about it. And the > author of both of them is my tutor. My search for SNA in local > sociological journals revealed only 4 articles. So, this > listserve is the only place for me to search an advice. That's > why I'm asking such a noob questions. > Alexander. > > > 2010/3/31 Balazs Vedres <[log in to unmask] > <mailto:[log in to unmask]> <mailto:[log in to unmask] > <mailto:[log in to unmask]>>> > > > ***** To join INSNA, visit http://www.insna.org ***** > > "rarely used" - I think it is very often used. > I guess you have your data already clustered by CONCOR, and you > would like > to present the reduced blockmatrix by MDS? That is fine. > You can also use MDS to represent the original structural > similarity measure > matrix, and possibly include the centroids of CONCOR blocks. > Anyhow, you will be much more exposed to criticism for adopting > CONCOR, than > for using MDS... > > -----Original Message----- > From: Social Networks Discussion Forum [mailto: > > > > -- > Carl Nordlund, BA, PhD student > carl.nordlund(at)hek.lu.se <http://hek.lu.se> > Human Ecology Division, Lund university > www.hek.lu.se <http://www.hek.lu.se> > > > > > -- > Alexander Semenov. > MA student > Faculty of Sociology > Moscow School of Social and Economic Sciences (MSSES) > http://www.msses.ru/English/index.html > > Graduate Student in Sociology at > State University - Higher School of Economics > http://www.hse.ru/eng -- Carl Nordlund, BA, PhD student carl.nordlund(at)hek.lu.se Human Ecology Division, Lund university www.hek.lu.se _____________________________________________________________________ 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.