arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2004.03503math.STmath-phmath.MPmath.RTstat.TH
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对称不变高斯模型空间中的模型选择

Model selection in the space of Gaussian models invariant by symmetry

Piotr Graczyk, Hideyuki Ishi, Bartosz Kołodziejek, Hélène Massam

摘要:

我们考虑多变量中心高斯模型的随机变量$Z=(Z_1,\ldots, Z_p)$,不变的作用下的一个子群的排列组$\{1,\ldots, p\}$。利用实数域上对称群的表示论,得到了协方差参数$Σ$的最大似然估计的分布以及精度参数$K=Σ^{-1}$的Diaconis-Ylvisaker共轭先验的归一化常数的解析表达式.因此,我们可以在完全高斯模型类中进行贝叶斯模型选择,该完全高斯模型不受对称群的子群的作用的影响,我们也可以称之为完全RCOP模型。我们说明了我们的结果与玩具的尺寸$4$和几个例子循环群内的选择,包括一个高维的例子与$p=100$的例子。

英文摘要:

We consider multivariate centered Gaussian models for the random variable $Z=(Z_1,\ldots, Z_p)$, invariant under the action of a subgroup of the group of permutations on $\{1,\ldots, p\}$. Using the representation theory of the symmetric group on the field of reals, we derive the distribution of the maximum likelihood estimate of the covariance parameter $Σ$ and also the analytic expression of the normalizing constant of the Diaconis-Ylvisaker conjugate prior for the precision parameter $K=Σ^{-1}$. We can thus perform Bayesian model selection in the class of complete Gaussian models invariant by the action of a subgroup of the symmetric group, which we could also call complete RCOP models. We illustrate our results with a toy example of dimension $4$ and several examples for selection within cyclic groups, including a high dimensional example with $p=100$.

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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