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arXiv 1104.1608math.STstat.TH
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具有对称性的图高斯模型格

Lattices of Graphical Gaussian Models with Symmetries

Helene Gehrmann

摘要:

为了使图形高斯模型的可行的建模工具时,变量的数量超过了观察,模型类的地方平等的限制浓度或偏相关先前已在文献中介绍。模型可以用顶点着色图和边着色图表示。对模型选择方法的需求使得理解模型类的结构成为当务之急。我们确定了四个模型类,形成完全格的模型包含,这使他们有资格的爱德华-Havránek模型选择程序。两个类最适合于相应的模型搜索。我们得到一个明确的搜索算法,其中之一,并提供了一个模型搜索的例子。

英文摘要:

In order to make graphical Gaussian models a viable modelling tool when the number of variables outgrows the number of observations, model classes which place equality restrictions on concentrations or partial correlations have previously been introduced in the literature. The models can be represented by vertex and edge coloured graphs. The need for model selection methods makes it imperative to understand the structure of model classes. We identify four model classes that form complete lattices of models with respect to model inclusion, which qualifies them for an Edwards-Havránek model selection procedure. Two classes turn out most suitable for a corresponding model search. We obtain an explicit search algorithm for one of them and provide a model search example for the other.

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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