Characterizing Existence and Location of the ML Estimate in the Conway–Maxwell–Poisson Model

IF 0.8 Q3 STATISTICS & PROBABILITY
Stefan Bedbur, Anton Imm, Udo Kamps
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引用次数: 0

Abstract

As a flexible extension of the common Poisson model, the Conway–Maxwell–Poisson distribution allows for describing under- and overdispersion in count data via an additional parameter. Estimation methods for two Conway–Maxwell–Poisson parameters are then required to specify the model. In this work, two characterization results are provided related to maximum likelihood estimation of the Conway–Maxwell–Poisson parameters. The first states that maximum likelihood estimation fails if and only if the range of the observations is less than two. Assuming that the maximum likelihood estimate exists, the second result then comprises a simple necessary and sufficient condition for the maximum likelihood estimate to be a solution of the likelihood equation; otherwise it lies on the boundary of the parameter set. A simulation study is carried out to investigate the accuracy of the maximum likelihood estimate in dependence of the range of the underlying observations.

Abstract Image

确定康威-麦克斯韦-泊松模型中 ML 估计值的存在性和位置
摘要 作为普通泊松模型的灵活扩展,康威-麦克斯韦-泊松分布允许通过一个附加参数来描述计数数据的欠分散和过分散。因此,需要两个 Conway-Maxwell 泊松参数的估计方法来指定模型。在这项工作中,提供了两个与康威-麦克斯韦-泊松参数最大似然估计有关的特征结果。第一个结果表明,当且仅当观测值的范围小于两个时,最大似然估计才会失败。假设存在最大似然估计,那么第二个结果就包含了一个简单的必要条件和充分条件,即最大似然估计是似然方程的一个解;否则,它就位于参数集的边界上。我们进行了一项模拟研究,以探讨最大似然估计的准确性与基本观测值范围的关系。
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来源期刊
Mathematical Methods of Statistics
Mathematical Methods of Statistics STATISTICS & PROBABILITY-
CiteScore
0.60
自引率
0.00%
发文量
2
期刊介绍: Mathematical Methods of Statistics  is an is an international peer reviewed journal dedicated to the mathematical foundations of statistical theory. It primarily publishes research papers with complete proofs and, occasionally, review papers on particular problems of statistics. Papers dealing with applications of statistics are also published if they contain new theoretical developments to the underlying statistical methods. The journal provides an outlet for research in advanced statistical methodology and for studies where such methodology is effectively used or which stimulate its further development.
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