Weijia,
if you only need degree centralization, Gabor suggests me those lines
of code and they work great:
## undirected graph
centralization<-(sum(max(degree(g))-degree(g)))/(vcount(g)-1)/
(vcount(g)-2
## directed graph
centralization<-(sum(max(degree(g))-degree(g)))/(2*vcount(g)-1)/
(vcount(g)-2
hope it helps,
Simone
Il giorno 30/nov/08, alle ore 17:05, Gábor Csárdi ha scritto:
Weijia, centralization was not included in igraph, because really, it
takes only writing a one line function to do it. But it is on our TODO
list and will be included soon.
E.g. for degree see the thread that starts here:
http://lists.gnu.org/archive/html/igraph-help/2008-11/msg00064.html
You can do it similarly for other measures, but first you need to find
out which structure is the most centralized for a given measure. E.g.
for degree it is the star graph, but not for eigenvector centrality.
Probably this is written in the classic Wasserman-Faust book.
Best,
Gabor
On Sun, Nov 30, 2008 at 1:37 PM, Weijia You <[EMAIL PROTECTED]>
wrote:
Hi all,
Is there anyone who ever used igraph to calculate the index of
"centralization" ?
I tried my best but can't find it in igraph.
The brief introduction to "centralization" can be found here , and
I think
it's an important index for measuring the centrality on the
aggregated
level.(http://faculty.ucr.edu/~hanneman/nettext/C10_Centrality.html)
Thank you for any comments and suggestions.
Best wishes!
Weijia
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