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Community Structure and Link Prediction in Networks

Newman, M (Michigan)
Thursday 24 June 2010, 14:00-14.45

Seminar Room 1, Newton Institute


We investigate two questions of broad interest in the study of networks: the discovery of “communities” (regions of unusually high density within networks) and link prediction (judgements about which links in a network are mostly likely to be either false negatives or false positives). We approach both problems using likelihood-based fits to appropriate random graph models, including stochastic block models, edge-placement models, and hierarchical models. The overall conclusion is that these models appear to work well in general, giving useful answers to the questions of interest, but that there are a number of substantive issues, about which our understanding is currently poor, that prevent their wider application.


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