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arXiv 1401.2267math.STstat.TH
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关于模型选择后的各种置信区间

On Various Confidence Intervals Post-Model-Selection

Hannes Leeb, Benedikt M. Pötscher, Karl Ewald

摘要:

我们比较了几个置信区间后,模型选择的设置最近研究的伯克等人。41(2013)802-837],其中目标是不覆盖真实参数,而是覆盖取决于所选模型的感兴趣的特定非标准量。特别是,我们将该参考文献中提出的PoSI区间与“朴素”置信区间进行了比较,该置信区间的构造就好像所选模型是正确的并且是先验固定的(因此忽略了模型选择的存在)。总体而言,我们发现,所有这些区间的实际覆盖概率偏离所需的名义覆盖概率只有适度。这一发现与现有文献中的几篇论文形成鲜明对比,这些论文的目标是覆盖真实参数。

英文摘要:

We compare several confidence intervals after model selection in the setting recently studied by Berk et al. [Ann. Statist. 41 (2013) 802-837], where the goal is to cover not the true parameter but a certain nonstandard quantity of interest that depends on the selected model. In particular, we compare the PoSI-intervals that are proposed in that reference with the "naive" confidence interval, which is constructed as if the selected model were correct and fixed a priori (thus ignoring the presence of model selection). Overall, we find that the actual coverage probabilities of all these intervals deviate only moderately from the desired nominal coverage probability. This finding is in stark contrast to several papers in the existing literature, where the goal is to cover the true parameter.

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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