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Improving on the maximum likelihood estimators of the means in Poisson decomposable graphical models


  • Hara, Hisayuki
  • Takemura, Akimichi


In this article we study the simultaneous estimation of the means in Poisson decomposable graphical models. We derive some classes of estimators which improve on the maximum likelihood estimator under the normalized squared losses. Our estimators are based on the argument in Chou [Simultaneous estimation in discrete multivariate exponential families, Ann. Statist. 19 (1991) 314-328.] and shrink the maximum likelihood estimator depending on the marginal frequencies of variables forming a complete subgraph of the conditional independence graph.

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  • Hara, Hisayuki & Takemura, Akimichi, 2007. "Improving on the maximum likelihood estimators of the means in Poisson decomposable graphical models," Journal of Multivariate Analysis, Elsevier, vol. 98(2), pages 410-434, February.
  • Handle: RePEc:eee:jmvana:v:98:y:2007:i:2:p:410-434

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    References listed on IDEAS

    1. Ghosh, Malay & Parsian, Ahmad, 1981. "Bayes minimax estimation of multiple Poisson parameters," Journal of Multivariate Analysis, Elsevier, vol. 11(2), pages 280-288, June.
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    Cited by:

    1. Consonni, Guido & Massam, Hélène, 2012. "Parametrizations and reference priors for multinomial decomposable graphical models," Journal of Multivariate Analysis, Elsevier, vol. 105(1), pages 380-396.


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