@techreport{NBERw0044,
 title = "The Statistical Analysis of Local Structure in Social Networks",
 author = "Paul W. Holland and Samuel Leinhardt",
 institution = "National Bureau of Economic Research",
 type = "Working Paper",
 series = "Working Paper Series",
 number = "44",
 year = "1974",
 month = "June",
 URL = "http://www.nber.org/papers/w0044",
 abstract = {We introduce the concept of a triad census of a digraph arid show how it can be used to enumerate various types of subgraph configurations. We give the basic probabilities needed for computing means and variances for a triad census under the U-MAN distribution for digraphs. These concepts are combined to provide a way of testing propositions about social structure using sociometric data. An application to 408 sociograms is given.},
}