Holland, Paul W. <br/><br/>
The Statistical Analysis of Local Structure in Social Networks / 
Paul W. Holland, Samuel Leinhardt. 
 - Cambridge, Mass.  National Bureau of Economic Research  1974. 
 - 1 online resource:  illustrations (black and white); 
 - NBER working paper series  no. w0044 .
 - Working Paper Series (National Bureau of Economic Research)  no. w0044. .
<br/><br/> June 1974. 
<br/><br/> 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. 
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