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Bayesian clustering in decomposable graphs. (English) Zbl 1330.62244

Summary: We propose a class of prior distributions on decomposable graphs, allowing for improved modeling flexibility. While existing methods solely penalize the number of edges, the proposed work empowers practitioners to control clustering, level of separation, and other features of the graph. Emphasis is placed on a particular prior distribution which derives its motivation from the class of product partition models; the properties of this prior relative to existing priors are examined through theory and simulation. We then demonstrate the use of graphical models in the field of agriculture, showing how the proposed prior distribution alleviates the inflexibility of previous approaches in properly modeling the interactions between the yield of different crop varieties. Lastly, we explore American voting data, comparing the voting patterns amongst the states over the last century.

MSC:

62H30 Classification and discrimination; cluster analysis (statistical aspects)
62F15 Bayesian inference
05C17 Perfect graphs
05C90 Applications of graph theory
62A09 Graphical methods in statistics
62P12 Applications of statistics to environmental and related topics
62P25 Applications of statistics to social sciences
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