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Hi - 

The node-connectivity / cohesive blocking approach that Doug White and I
have proposed similarly allows overlapping structure, so it's not a complete
"blind spot"; and does so in a way where the overlap structure can be
formally explicated.  See:
http://www2.asanet.org/journals/ASRFeb03MoodyWhite.pdf .  The advantage of
node-connectivity for understanding social cohesion is the clear link
between diffusion-through-multiple paths and higher-orders of
k-connectivity.

Best,
Jim 


-----Original Message-----
From: Social Networks Discussion Forum [mailto:[log in to unmask]] On
Behalf Of Balazs Vedres
Sent: Sunday, January 03, 2010 6:02 AM
To: [log in to unmask]
Subject: Re: community identification algorithms: KliqueFinder

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There seems to be a blindspot in sociology for overlapping groups. We used
the Clique Percolation Method:

http://angel.elte.hu/cfinder/

that yielded interesting theoretical benefits to specify the significance of
structural folding (the overlapping of groups) for entrepreneurial
recombination and generative tension. Business groups do tend to overlap a
lot, and overlapping groups are better performing, but more unstable.
Needless to say, you need a historical dataset to understand what cohesion
means (as Simmel, Moreno, and the early theoretical school of network ties
clearly saw).

http://www.personal.ceu.hu/staff/Balazs_Vedres/papers/vedres.stark.folds.pdf

This article appears in the January issue of AJS.

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