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arXiv 1604.04768stat.ME
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最大似然估计的中位偏差减小

Median bias reduction of maximum likelihood estimates

Euloge Clovis, Kenne Pagui, Alessandra Salvan, Nicola Sartori

摘要:

对于经常性的参数问题,我们展示了如何中位数居中的最大似然估计可以通过一个简单的修改得分方程。对于感兴趣的标量参数,该估计在关注参数化下是等变的,并且是三阶中位无偏的。与感兴趣的矢量参数,分量的等方差和三阶中值中心。与Firth(1993,Biometrika)的隐式方法一样,新方法不要求最大似然估计的有限性,并能有效地防止无穷大估计。连续和离散模型,包括二进制和β回归的模拟结果证实,该方法成功地实现了分量中位数中心化,并在解决无限估计问题,同时保持可比的分散和相同的近似分布,其主要竞争对手。

英文摘要:

For regular parametric problems, we show how median centering of the maximum likelihood estimate can be achieved by a simple modification of the score equation. For a scalar parameter of interest, the estimator is equivariant under interest respecting parameterizations and third-order median unbiased. With a vector parameter of interest, componentwise equivariance and third-order median centering are obtained. Like Firth's (1993, Biometrika) implicit method for bias reduction, the new method does not require finiteness of the maximum likelihood estimate and is effective in preventing infinite estimates. Simulation results for continuous and discrete models, including binary and beta regression, confirm that the method succeeds in achieving componentwise median centering and in solving the infinite estimate problem, while keeping comparable dispersion and the same approximate distribution as its main competitors.

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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