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arXiv 1104.5341stat.ML
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线性非高斯非循环模型的联合估计

Joint estimation of linear non-Gaussian acyclic models

Shohei Shimizu

摘要:

线性非高斯结构方程模型LiNGAM是一种可识别的探索性因果分析模型。先前的方法基于单个数据集估计变量的因果排序及其连接强度。然而,在许多应用领域中,数据是在不同的条件下获得的,即,获得多个数据集而不是单个数据集。在本文中,我们提出了一种新的方法来联合估计多个LiNGAM的假设下,模型共享一个因果排序,但可能有不同的连接强度和不同分布的变量。在模拟中,新方法比单独估计模型更准确地估计模型。

英文摘要:

A linear non-Gaussian structural equation model called LiNGAM is an identifiable model for exploratory causal analysis. Previous methods estimate a causal ordering of variables and their connection strengths based on a single dataset. However, in many application domains, data are obtained under different conditions, that is, multiple datasets are obtained rather than a single dataset. In this paper, we present a new method to jointly estimate multiple LiNGAMs under the assumption that the models share a causal ordering but may have different connection strengths and differently distributed variables. In simulations, the new method estimates the models more accurately than estimating them separately.

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