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10.1093/biomet/asu051

http://scihub22266oqcxt.onion/10.1093/biomet/asu051
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C5018402!5018402!27625437
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pmid27625437      Biometrika 2015 ; 102 (1): 47-64
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  • Selection and estimation for mixed graphical models #MMPMID27625437
  • Chen S; Witten DM; shojaie A
  • Biometrika 2015[Mar]; 102 (1): 47-64 PMID27625437show ga
  • We consider the problem of estimating the parameters in a pairwise graphical model in which the distribution of each node, conditioned on the others, may have a different exponential family form. We identify restrictions on the parameter space required for the existence of a well-defined joint density, and establish the consistency of the neighbourhood selection approach for graph reconstruction in high dimensions when the true underlying graph is sparse. Motivated by our theoretical results, we investigate the selection of edges between nodes whose conditional distributions take different parametric forms, and show that efficiency can be gained if edge estimates obtained from the regressions of particular nodes are used to reconstruct the graph. These results are illustrated with examples of Gaussian, Bernoulli, Poisson and exponential distributions. Our theoretical findings are corroborated by evidence from simulation studies.
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