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arXiv 1901.03556math.STstat.TH
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递归max-线性模型的可辨识性与估计

Identifiability and estimation of recursive max-linear models

Nadine Gissibl, Claudia Klüppelberg, Steffen Lauritzen

摘要:

研究了边加权有向无圈图(DAG)表示的递归最大线性结构方程模型的可辨识性和估计问题。这样的模型通常是不可识别的,我们确定了整个类的DAG和边缘权重对应于一个给定的观测分布。对于估计,不能应用标准似然理论,因为相应的分布族不是支配的。鉴于基本的DAG,我们提出了一个估计的边缘权重类,并表明它可以被认为是一个广义的最大似然估计。此外,我们开发了一种简单的方法来确定的DAG的结构。随着概率随着观测值的数量以指数速率趋于1,该方法正确地识别了DAG的类别,并且类似地,准确地识别了可能的边权重。

英文摘要:

We address the identifiablity and estimation of recursive max-linear structural equation models represented by an edge weighted directed acyclic graph (DAG). Such models are generally unidentifiable and we identify the whole class of DAGs and edge weights corresponding to a given observational distribution. For estimation, standard likelihood theory cannot be applied because the corresponding families of distributions are not dominated. Given the underlying DAG, we present an estimator for the class of edge weights and show that it can be considered a generalized maximum likelihood estimator. In addition, we develop a simple method for identifying the structures of the DAGs. With probability tending to one at an exponential rate with the number of observations, this method correctly identifies the class of DAGs and, similarly, exactly identifies the possible edge weights.

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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