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arXiv 1903.06552stat.ME
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关于以Bootstrap光滑估计为中心的置信区间

On confidence intervals centered on bootstrap smoothed estimators

Paul Kabaila, Christeen Wijethunga

摘要:

Bootstrap平滑(袋装)估计已被提出作为一个改进的估计后发现初步的数据为基础的模型选择。Efron,2014年,推导出了一个广泛适用的公式,用于delta方法近似自举平滑估计量的标准差。他还考虑了以自举平滑估计量为中心的置信区间,其宽度与该标准差的估计值成比例。Kabaila和Wijethunga(2019)评估了该置信区间在两个嵌套线性回归模型(完整模型和简单模型)场景中的性能,用于已知误差方差和使用假设检验进行初步模型选择的情况。他们发现,这个置信区间的性能并不比基于全模型的通常的置信区间有实质性的改善,具有相同的最小覆盖率。我们扩展这种评估的情况下,未知的误差方差推导出一个计算方便的精确公式的理想(即在限制的自举复制的数量发散到无穷大)δ方法近似的自举平滑估计的标准差。我们的研究结果表明,与已知的误差方差的情况下,有这种置信区间具有吸引力的性质的情况下。

英文摘要:

Bootstrap smoothed (bagged) estimators have been proposed as an improvement on estimators found after preliminary data-based model selection. Efron, 2014, derived a widely applicable formula for a delta method approximation to the standard deviation of the bootstrap smoothed estimator. He also considered a confidence interval centered on the bootstrap smoothed estimator, with width proportional to the estimate of this standard deviation. Kabaila and Wijethunga, 2019, assessed the performance of this confidence interval in the scenario of two nested linear regression models, the full model and a simpler model, for the case of known error variance and preliminary model selection using a hypothesis test. They found that the performance of this confidence interval was not substantially better than the usual confidence interval based on the full model, with the same minimum coverage. We extend this assessment to the case of unknown error variance by deriving a computationally convenient exact formula for the ideal (i.e. in the limit as the number of bootstrap replications diverges to infinity) delta method approximation to the standard deviation of the bootstrap smoothed estimator. Our results show that, unlike the known error variance case, there are circumstances in which this confidence interval has attractive properties.

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