Local shrinkage rules, Levy processes, and regularized regression

Details Local shrinkage rules, Levy processes, and regularized regression Local shrinkage rules, Levy processes, and regularized regression

2010-10-17

arxiv.org/abs/1010.3390v2

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We use Levy processes to generate joint prior distributions, and therefore penalty functions, for a location parameter as p grows large. This generalizes the class of local-global shrinkage rules based on scale mixtures of normals, illuminates new connections among disparate methods, and leads to new results for computing posterior means and modes under a wide class of priors. We extend this framework to large-scale regularized regression problems where p>n, and provide comparisons with other methodologies.

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