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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
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