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arXiv 2103.10058math.STstat.MEstat.TH
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多元Poisson模型中独立性检验的Bartlett校正

Bartlett correction of an independence test in a multivariate Poisson model

Rolf Larsson

摘要:

我们考虑一个相依泊松变量系统,其中每个变量是一个独立变量和一个公共变量之和。这是共同的变量,创造了相关性。在该系统中,可以构建独立性检验,其中原假设是公共变量相同为零。本文考虑最大对数似然比检验。对于该检验,众所周知,检验统计量的渐近分布是零和具有一个自由度的χ 2分布的相等混合。我们研究了该检验的Bartlett校正,希望我们能更好地近似中等大样本量的标称量。这种校正是明确推导出来的,并在模拟研究中探讨其实用性。为了实际的目的,校正被发现是有用的,在二维,但不是在更高的维度。

英文摘要:

We consider a system of dependent Poisson variables, where each variable is the sum of an independent variate and a common variate. It is the common variate that creates the dependence. Within this system, a test of independence may be constructed where the null hypothesis is that the common variate is identically zero. In the present paper, we consider the maximum log likelihood ratio test. For this test, it is well-known that the asymptotic distribution of the test statistic is an equal mixture of zero and a chi square distribution with one degree of freedom. We examine a Bartlett correction of this test, in the hope that we will get better approximation of the nominal size for moderately large sample sizes. This correction is explicitly derived, and its usefulness is explored in a simulation study. For practical purposes, the correction is found to be useful in dimension two, but not in higher dimensions.

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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