Thomas W. Valente

in Social Networks and Health

Published in print February 2010 | ISBN: 9780195301014
Published online May 2010 | e-ISBN: 9780199777051 | DOI:

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  • Medical Statistics and Methodology


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This chapter describes how network analysts define and measure groups. Components are the building blocks of group definitions and consist of all the nodes connected to each other through any number of steps in network. Nodes that cannot reach each other are in different components. More complex group definitions are then provided, namely, k-plexes and n-cliques which permit variation in the degree of connectivity among group members needed to be a group member. The Newman-Girvan (2004) algorithm is introduced which provides mutually exclusive groups and a measure of how well the group definitions characterize the data. The chapter closes with a discussion of how groups influence behavior.

Keywords: network groups; Newman-Girvan; cliques; norms

Chapter.  5245 words.  Illustrated.

Subjects: Medical Statistics and Methodology

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