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arXiv 1905.06261stat.ME
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两两图模型的广义得分匹配同时推理

Simultaneous Inference for Pairwise Graphical Models with Generalized Score Matching

Ming Yu, Varun Gupta, Mladen Kolar

摘要:

概率图模型为网络中节点间的依赖关系建模提供了一个灵活而简洁的框架。关于图形模型的参数估计和一致模型选择有大量的文献。然而,在许多应用中,科学家们也有兴趣量化与估计参数和选定的模型,目前的文献还没有彻底解决的不确定性。基于广义Hyvärinen评分规则,提出了一种新的两两图模型边缘参数的统计推断估计. Hyvärinen评分规则在无法以封闭形式有效获得归一化常数的情况下特别有用,这是图形模型(包括Ising模型和截断高斯图形模型)的常见问题。我们的估计允许我们执行一般图形模型的统计推断,而现有的工作主要集中在高斯图形模型的统计推断,找到归一化常数是计算上容易处理的。在温和的条件下,通常假设在文献中的一致性估计,我们证明了我们提出的估计是$\sqrt{n}$ -一致和渐近正态,这使我们能够构建置信区间,并建立假设检验的边缘参数。此外,我们展示了我们所提出的方法可以应用于测试假设,同时涉及大量的模型参数。我们说明了我们的估计的有效性,通过广泛的模拟研究,收集不同的数据生成过程。

英文摘要:

Probabilistic graphical models provide a flexible yet parsimonious framework for modeling dependencies among nodes in networks. There is a vast literature on parameter estimation and consistent model selection for graphical models. However, in many of the applications, scientists are also interested in quantifying the uncertainty associated with the estimated parameters and selected models, which current literature has not addressed thoroughly. In this paper, we propose a novel estimator for statistical inference on edge parameters in pairwise graphical models based on generalized Hyvärinen scoring rule. Hyvärinen scoring rule is especially useful in cases where the normalizing constant cannot be obtained efficiently in a closed form, which is a common problem for graphical models, including Ising models and truncated Gaussian graphical models. Our estimator allows us to perform statistical inference for general graphical models whereas the existing works mostly focus on statistical inference for Gaussian graphical models where finding normalizing constant is computationally tractable. Under mild conditions that are typically assumed in the literature for consistent estimation, we prove that our proposed estimator is $\sqrt{n}$-consistent and asymptotically normal, which allows us to construct confidence intervals and build hypothesis tests for edge parameters. Moreover, we show how our proposed method can be applied to test hypotheses that involve a large number of model parameters simultaneously. We illustrate validity of our estimator through extensive simulation studies on a diverse collection of data-generating processes.

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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