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On Tue, 2003-02-11 at 14:07, Balazs Vedres wrote:
> I wonder how SNA packages will move to finally embrace and serve growing
> interest in network dynamics. Especially in visualization I get little
> help from the otherwise (more and more) terrific packages:
> UCINET, NETDRAW and PAJEK.
> A first step that I would find very useful would be to incorporate
> procrustean analysis (or adjustment) into multidimensional scaling (or
> spring embedder) modules that are part of each of these packages.
> Procrustean adjustment would enable those interested in drawing networks
> (of more or less the same actors) in consecutive time periods to see the
> effect of network change on graphs, and filter out the effect of
> contingency (by invariant transformations).
> Is there any package that is able to accomplish this?
As far as I know, there are several tools which allow you to display a
graph with specified vertex coordinates (I'm pretty sure that Pajek
does, and you can do it with the gplot() routine in R)...thus, you could
use your general algorithm to compute the solutions at each time point,
and then plot the graphs using the resulting coordinate solutions. I'm
pretty sure there's an R package which provides procrustean analysis, so
that might be a place to start -- I have not attempted that per se,
although I have used transformed sequential MDS solutions to achieve a
similar kind of display with gplot(), and thus it certainly can be done.
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