Tree-structured Markov random fields with Poisson marginal distributions
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arXiv
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| Main Authors: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866909458240634880 |
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| author | Côté, Benjamin Cossette, Hélène Marceau, Etienne |
| author_facet | Côté, Benjamin Cossette, Hélène Marceau, Etienne |
| contents | A new family of tree-structured Markov random fields for a vector of discrete counting random variables is introduced. According to the characteristics of the family, the marginal distributions of the Markov random fields are all Poisson with the same mean, and are untied from the strength or structure of their built-in dependence. This key feature is uncommon for Markov random fields and most convenient for applications purposes. The specific properties of this new family confer a straightforward sampling procedure and analytic expressions for the joint probability mass function and the joint probability generating function of the vector of counting random variables, thus granting computational methods that scale well to vectors of high dimension. We study the distribution of the sum of random variables constituting a Markov random field from the proposed family, analyze a random variable's individual contribution to that sum through expected allocations, and establish stochastic orderings to assess a wide understanding of their behavior. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2408_13649 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Tree-structured Markov random fields with Poisson marginal distributions Côté, Benjamin Cossette, Hélène Marceau, Etienne Methodology Machine Learning Probability Primary 62H22, secondary 60G60 A new family of tree-structured Markov random fields for a vector of discrete counting random variables is introduced. According to the characteristics of the family, the marginal distributions of the Markov random fields are all Poisson with the same mean, and are untied from the strength or structure of their built-in dependence. This key feature is uncommon for Markov random fields and most convenient for applications purposes. The specific properties of this new family confer a straightforward sampling procedure and analytic expressions for the joint probability mass function and the joint probability generating function of the vector of counting random variables, thus granting computational methods that scale well to vectors of high dimension. We study the distribution of the sum of random variables constituting a Markov random field from the proposed family, analyze a random variable's individual contribution to that sum through expected allocations, and establish stochastic orderings to assess a wide understanding of their behavior. |
| title | Tree-structured Markov random fields with Poisson marginal distributions |
| topic | Methodology Machine Learning Probability Primary 62H22, secondary 60G60 |
| url | https://arxiv.org/abs/2408.13649 |