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[igraph] community detection

From: zhengjun chen
Subject: [igraph] community detection
Date: Thu, 21 Jan 2010 10:39:14 -0500


I run fastgreedy community detection algorithm on my dataset. I get a number of communities, and the modularity is 0.586.
Then I take a look at one of the communities. It has 170 vertices. 
I found it has 253 edges inside the community, but 391 edges towards vertices outside the community.
This is contrary to my intuition of community. A good community should have more edges inside, and less edges towards outside.
So, what is wrong?


Graduate research assistant
Dept of Computer Science and Engineering
Lehigh University

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