In directed graphs, relationships are asymmetric and these asymmetries contain essential structural information about the graph. Directed relationships lead to a new type of clustering that is not ...

The Annals of Statistics, Vol. 26, No. 4 (Aug., 1998), pp. 1434-1495 (62 pages) A chain graph (CG) is a graph admitting both directed and undirected edges with (partially) directed cycles forbidden.