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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.
Beatrix Jones, Mike West, Covariance Decomposition in Undirected Gaussian Graphical Models, Biometrika, Vol. 92, No. 4 (Dec., 2005), pp. 779-786 ...
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