Parameter Collapse due to the Zeros in the Inverse Condition

Details Parameter Collapse due to the Zeros in the Inverse Condition Parameter Collapse due to the Zeros in the Inverse Condition

2008-03-08

arxiv.org/abs/0803.1225v1

Mathematics

Probability

9 pages, 2 figures, SEAM

Scientific paper

Helton, Lasserre, and Putinar (2008, Ann. Probability; arXiv:math/0702314) expose the relationship between three properties of a measure: the conditional triangularity property of the associated orthogonal polynomials, the zeros in the inverse condition of the truncated moment matrix, and conditional independence. The purpose of this article is to provide examples of parameter collapse to product structure given that the zeros in the inverse condition holds up to some degree d. Specifically, start with a parameterized family of probability density functions; require that the zeros in the inverse condition up to degree d holds; and validate that imposing this restriction on the parameterized family results in a measure with product structure, or at least that conditional independence holds. Algorithms related to parameter collapse are supplied, including the computation of the zeros in the inverse condition up to degree d.

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