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arXiv 2008.03971math.STstat.TH
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关于含潜变量模型似然比检验的一则注记

A Note on Likelihood Ratio Tests for Models with Latent Variables

Yunxiao Chen, Irini Moustaki, Haoran Zhang

AI总结:

本文针对含潜变量嵌套模型中 LRT 的 χ² 近似失效问题,借助三个模型实例说明 Wilks 定理正则条件的违反,并引入 Chernoff 的更一般渐近理论予以正确解释。

摘要:

似然比检验(LRT)被广泛用于比较嵌套潜变量模型的相对拟合优度。依据 Wilks 定理,进行 LRT 时需将 LRT 统计量与其在受限模型下的渐近分布进行比较,该分布为 χ² 分布,自由度等于所比较的两个嵌套模型之间自由参数数量之差。然而,对于因子分析、结构方程模型和随机效应模型等含潜变量的模型,人们常发现 χ² 近似并不成立。在本注记中,我们通过三个含潜变量模型的例子,说明 Wilks 定理的正则性条件可能如何被违反。此外,本文给出了一种更一般的 LRT 理论,为这些 LRT 提供正确的渐近理论。这一一般理论最早由 Chernoff(1954)建立,并在 van der Vaart(2000)与 Drton(2009)中均有讨论,但似乎尚未得到足够重视。我们用上述三个例子对该一般理论加以阐释。

英文摘要:

The likelihood ratio test (LRT) is widely used for comparing the relative fit of nested latent variable models. Following Wilks' theorem, the LRT is conducted by comparing the LRT statistic with its asymptotic distribution under the restricted model, a $χ^2$-distribution with degrees of freedom equal to the difference in the number of free parameters between the two nested models under comparison. For models with latent variables such as factor analysis, structural equation models and random effects models, however, it is often found that the $χ^2$ approximation does not hold. In this note, we show how the regularity conditions of Wilks' theorem may be violated using three examples of models with latent variables. In addition, a more general theory for LRT is given that provides the correct asymptotic theory for these LRTs. This general theory was first established in Chernoff (1954) and discussed in both van der Vaart (2000) and Drton (2009), but it does not seem to have received enough attention. We illustrate this general theory with the three examples.

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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