This week we take up two, interrelated, topics: (1) how to characterize the structure of entire networks (e.g., measure its cohesion), and (b) how to detect cohesive subgroups.
Supplementary Readings (optional)
Borgatti, S. P., Everett, M. G., & Shirey, P. 1990. LS sets, lambda sets and other cohesive subsets. Social Networks, 12: 337-357. [pdf]
Borgatti, S.P. How to explain hierarchical clustering. [html]
Girvan and Newman. http://arxiv.org/abs/cond-mat/0112110