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arXiv 2109.14010stat.MEstat.AP
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惩罚似然方法用于计数数据建模

Penalized Likelihood Methods for Modeling Count Data

Texas Christian University(德克萨斯基督教大学);University of Johannesburg(约翰内斯堡大学);Southern Methodist University(南方卫理公会大学)

Minh Thu Bui, Cornelis J. Potgieter, Akihito Kamata

AI总结:

本文探讨了使用惩罚似然方法对计数数据模型进行参数估计,通过模拟研究评估了惩罚估计的效用,并分析了口腔阅读流利度数据。

摘要:

本文考虑了使用惩罚似然方法对计数数据模型进行参数估计。动机数据由多个独立计数变量组成,每个变量的样本量适中。这些数据是在评估学龄儿童口腔阅读流利度(ORF)时收集的。四年级学生被分配阅读十个不同长度和难度的段落之一。观察到的错误单词数(WRI)用于测量ORF。考虑了三种WRI分数模型:二项式、零膨胀二项式和贝塔二项式。我们旨在高效估计段落难度,该量以基础模型参数函数形式表达。考虑了两种惩罚函数类型,分别旨在使参数估计值更接近零或彼此更接近。通过模拟研究评估了缩减估计的效用,使用均方误差(MSE)作为度量。与无惩罚最大似然相比,观察到MSE显著降低。本文最后对动机ORF数据进行了分析。

英文摘要:

The paper considers parameter estimation in count data models using penalized likelihood methods. The motivating data consists of multiple independent count variables with a moderate sample size per variable. The data were collected during the assessment of oral reading fluency (ORF) in school-aged children. A sample of fourth-grade students were given one of ten available passages to read with these differing in length and difficulty. The observed number of words read incorrectly (WRI) is used to measure ORF. Three models are considered for WRI scores, namely the binomial, the zero-inflated binomial, and the beta-binomial. We aim to efficiently estimate passage difficulty, a quantity expressed as a function of the underlying model parameters. Two types of penalty functions are considered for penalized likelihood with respective goals of shrinking parameter estimates closer to zero or closer to one another. A simulation study evaluates the efficacy of the shrinkage estimates using Mean Square Error (MSE) as metric. Big reductions in MSE relative to unpenalized maximum likelihood are observed. The paper concludes with an analysis of the motivating ORF data.

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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