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arXiv 1610.09802stat.ME
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以Bootstrap平滑估计量为中心的置信区间

Confidence intervals centered on bootstrap smoothed estimators

Paul Kabaila, Christeen Wijethunga

摘要:

Bootstrap平滑(袋装)参数估计已被提出作为一个改进的估计后发现初步的基于数据的模型选择。Efron(2014)的关键结果是一个非常方便且广泛适用的公式,用于delta方法近似自助平滑估计量的标准差。这种近似提供了一个容易计算的指南,这个估计的准确性。此外,Efron(2014)提出了一个以自助平滑估计量为中心的置信区间,其宽度与该近似值对标准差的估计成正比。我们在两个嵌套线性回归模型(完整模型和简单模型)的情况下评估此置信区间,并对简单模型正确的原假设进行初步检验。我们推导出计算方便的表达式的理想自举平滑估计和覆盖概率和预期长度的置信区间。在覆盖概率方面,该置信区间优于具有相同标称覆盖率且基于相同初步检验的模型选择后的置信区间。我们还比较了性能的置信区间为中心的自举平滑估计,在预期的长度,通常的置信区间,具有相同的最小覆盖概率,基于完整的模型。

英文摘要:

Bootstrap smoothed (bagged) parameter estimators have been proposed as an improvement on estimators found after preliminary data-based model selection. The key result of Efron (2014) is a very convenient and widely applicable formula for a delta method approximation to the standard deviation of the bootstrap smoothed estimator. This approximation provides an easily computed guide to the accuracy of this estimator. In addition, Efron (2014) proposed a confidence interval centered on the bootstrap smoothed estimator, with width proportional to the estimate of this approximation to the standard deviation. We evaluate this confidence interval in the scenario of two nested linear regression models, the full model and a simpler model, and a preliminary test of the null hypothesis that the simpler model is correct. We derive computationally convenient expressions for the ideal bootstrap smoothed estimator and the coverage probability and expected length of this confidence interval. In terms of coverage probability, this confidence interval outperforms the post-model-selection confidence interval with the same nominal coverage and based on the same preliminary test. We also compare the performance of confidence interval centered on the bootstrap smoothed estimator, in terms of expected length, to the usual confidence interval, with the same minimum coverage probablility, based on the full model.

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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