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arXiv 0809.4205stat.ME
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零通货膨胀和过度分散的检验

Tests for zero-inflation and overdispersion

A. Baillo, J. Carcamo, J. R. Berrendero

摘要:

我们提出了一种新的方法来检测零通货膨胀和过度分散,该方法基于凸序分布中预期样本极端值的比较。该方法是非常灵活的,包括零膨胀模型的结构零点的比例测试,测试,以区分两个有序的参数家庭和一个新的一般测试,以检测过度分散。所提出的测试的性能进行评估,通过一些模拟研究。对于公知的胎羊数据,我们得出结论,零膨胀泊松模型应该拒绝其他更分散的模型,但我们不能拒绝负二项模型。

英文摘要:

We propose a new methodology to detect zero-inflation and overdispersion based on the comparison of the expected sample extremes among convexly ordered distributions. The method is very flexible and includes tests for the proportion of structural zeros in zero-inflated models, tests to distinguish between two ordered parametric families and a new general test to detect overdispersion. The performance of the proposed tests is evaluated via some simulation studies. For the well-known fetal lamb data, we conclude that the zero-inflated Poisson model should be rejected against other more disperse models, but we cannot reject the negative binomial model.

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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