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arXiv 1402.5384stat.ME
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基于对数线性模型的似然比阶Phi-发散统计量

Phi-divergence statistics for the likelihood ratio order: an approach based on log-linear models

Nirian Martín, Raquel Mata, Leandro Pardo

摘要:

当一些治疗根据有序分类变量的类别排序时(例如,副作用的程度),人们可能有兴趣知道治疗是否同样有效。一种方法是测试似然比顺序是否得到严格验证。推导了一种基于对数线性模型的统计推断方法,并提出了用于检验的φ-散度检验统计量。本文以对数线性模型为研究对象,建立了φ-散度检验统计量的渐近分布理论。一个说明性的例子激励的程序和模拟研究的小和中等的样本量表明,它是可能的,找到一个确切的大小更接近标称大小和更高的权力相比,经典的似然比的Φ发散检验统计量。

英文摘要:

When some treatments are ordered according to the categories of an ordinal categorical variable (e.g., extent of side effects) in a monotone order, one might be interested in knowing wether the treatments are equally effective or not. One way to do that is to test if the likelihood ratio order is strictly verified. A method based on log-linear models is derived to make statistical inference and phi-divergence test-statistics are proposed for the test of interest. Focussed on loglinear modeling, the theory associated with the asymptotic distribution of the phi-divergence test-statistics is developed. An illustrative example motivates the procedure and a simulation study for small and moderate sample sizes shows that it is possible to find phi-divergence test-statistic with an exact size closer to nominal size and higher power in comparison with the classical likelihood ratio.

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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