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arXiv 1706.02563stat.MEmath.STstat.TH
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混合估计的Jeffreys先验:性质与替代

Jeffreys priors for mixture estimation: properties and alternatives

Clara Grazian, Christian P. Robert

摘要:

虽然Jeffreys先验通常对于混合分布的参数是定义良好的,但它们并不以封闭形式提供。此外,他们往往是不适当的先验。因此,它们从未被用来推断混合参数。研究了Jeffreys先验在几种混合情况下的实现及其性质。结果表明,相关的后验分布往往是不适当的。然而,Jeffreys先验的混合物的权重有条件的参数的混合物组件将被证明具有相对于组件的数量的保守性的属性,在过拟合的混合物的情况下,它可以被用作默认的先验在这种情况下。

英文摘要:

While Jeffreys priors usually are well-defined for the parameters of mixtures of distributions, they are not available in closed form. Furthermore, they often are improper priors. Hence, they have never been used to draw inference on the mixture parameters. The implementation and the properties of Jeffreys priors in several mixture settings are studied. It is shown that the associated posterior distributions most often are improper. Nevertheless, the Jeffreys prior for the mixture weights conditionally on the parameters of the mixture components will be shown to have the property of conservativeness with respect to the number of components, in case of overfitted mixture and it can be therefore used as a default priors in this context.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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