Re: [R] about centralization
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 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. -- Gabor Csardi <[EMAIL PROTECTED]> UNIL DGM __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
Re: [R] about centralization
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 > >[[alternative HTML version deleted]] > > __ > R-help@r-project.org mailing list > https://stat.ethz.ch/mailman/listinfo/r-help > PLEASE do read the posting guide http://www.R-project.org/posting-guide.html > and provide commented, minimal, self-contained, reproducible code. > -- Gabor Csardi <[EMAIL PROTECTED]> UNIL DGM __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
[R] about centralization
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 [[alternative HTML version deleted]] __ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
