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arXiv 2404.03346math.STstat.TH
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基于排序集抽样的 log-logistic 模型稳健估计量

Robust estimators for the log-logistic model based on ranked set sampling

Ángel Felipe, María Jaenada, Pedro Miranda, Leandro Pardo

AI总结:

针对排序集抽样下的 log-logistic 分布,提出基于密度幂散度的形状与尺度参数稳健估计量,推导其渐近分布并通过模拟验证其抗污染性和效率竞争力。

摘要:

本文引入了一族新的估计量,用于估计 log-logistic 分布的形状参数和尺度参数;当采用排序集抽样方法选择数据时,这些估计量具有稳健性。排序集抽样是作为降低极端数据影响的一种方法而出现的。log-logistic 分布是一种重要分布,适用于对从经济到工程和水文学等许多不同情形进行建模。这一新的估计量族基于密度幂散度。选择该族散度度量的动机是,它们在稳健性方面表现出非常好的性能,同时效率损失较小。这个新的估计量族将经典最大似然估计量作为特例包含在内。我们给出了这些估计量的形式,并推导了其相应的渐近分布。文中开展了模拟研究,结果表明:当出现污染时,这些新估计量非常稳健,并且在效率方面与经典估计量具有竞争力。

英文摘要:

In this paper we introduce a new family of estimators for the parameters of shape and scale of the log-logistic distribution being robust when rank set sample method is used to select the data. Rank set sampling arises as a way to reduce the impact of extremal data. Log-logistic distribution is an important distribution suitable for modeling many different situations ranging from Economy to Engineering and Hydrology. This new family of estimators is based on density power divergences. The choice of this family of divergence measures is motivated by the fact that they have shown a very good behavior in terms of robustness at a reduced cost in efficiency. This new family recovers the classical maximum likelihood estimator as a special case. We have developed the form of these estimators and derived their corresponding asymptotic distribution. A simulation study is carried out, suggesting that these new estimators are very robust when contamination arises and are competitive with classical estimators in terms of efficiency.

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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