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arXiv 0901.0455math.STstat.TH
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指数族的似然推断与衰退方向

Likelihood Inference in Exponential Families and Directions of Recession

Charles J. Geyer

摘要:

当全指数族中不存在最大似然估计时,该估计可能存在于该族的Barndorff-Nielsen完备化中。利用R语言提供的程序包rcdd,提出了一种求解重复线性规划完备化问题最大似然估计的实用算法,并以两个广义线性模型为例进行了说明.当原假设的极大似然估计为完备时,模型比较的似然比检验与通常情况几乎没有变化。只有自由度需要调整。当最大似然估计位于完备时,置信区间的变化比通常情况大得多。自然参数的最大似然估计可以被认为在某个方向上趋于无穷大,我们称之为一般的衰退回收方向。我们提出了一个新的单侧置信区间,它表示自然参数可能多么接近无穷大。这映射到平均值的单侧置信区间,显示它们与支持边界的接近程度。

英文摘要:

When in a full exponential family the maximum likelihood estimate (MLE) does not exist, the MLE may exist in the Barndorff-Nielsen completion of the family. We propose a practical algorithm for finding the MLE in the completion based on repeated linear programming using the R contributed package rcdd and illustrate it with two generalized linear model examples. When the MLE for the null hypothesis lies in the completion, likelihood ratio tests of model comparison are almost unchanged from the usual case. Only the degrees of freedom need to be adjusted. When the MLE lies in the completion, confidence intervals are changed much more from the usual case. The MLE of the natural parameter can be thought of as having gone to infinity in a certain direction, which we call a generic direction of recession. We propose a new one-sided confidence interval which says how close to infinity the natural parameter may be. This maps to one-sided confidence intervals for mean values showing how close to the boundary of their support they may be.

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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