[R] connectivity measure for graph nodes

From: Mark W Kimpel <mwkimpel_at_gmail.com>
Date: Tue, 04 Mar 2008 21:03:46 -0500

I am doing some work the Rgraphviz, a Bioconductor package, but since my question is of a more general nature, thought I would send to this list in hopes that a graph theory expert could answer my question.

I wish to do some statistics on node-node relationships. In particular, I want to see if two connected nodes share a common property. I believe that the more "connected" the two nodes are the more likely it would be that they share the property. The graph is highly connected, with a large majority of nodes connected in some fashion.

My first question is: can anyone make this real easy and tell me if this has been done and how?

If not, I need to start with developing a measure of connectedness that includes degrees of separation and number of edges at each degree. The highest level of connectivity, with weighting 1, would be a first order connection (the graph is undirected). Beyond that, of course, it gets more complicated. To begin, I need to identify the best path between two nodes then characterize that path.

Rgraphviz seems to have a fair amount of rendering capabilities, but I don't see many functions to statistically analyze the graph.



Mark W. Kimpel MD  ** Neuroinformatics ** Dept. of Psychiatry
Indiana University School of Medicine

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Received on Wed 05 Mar 2008 - 02:08:59 GMT

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