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arXiv math/0604488math.PRmath.STstat.TH
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Wishart矩阵的子式的矩

Moments of minors of Wishart matrices

Mathias Drton, Hélène Massam, Ingram Olkin

摘要:

对于服从Wishart分布的随机矩阵,我们导出了复合矩阵的期望和协方差阵的计算公式。$m$阶的复合矩阵由Wishart矩阵的所有$m\times m$ -子式填充。我们的结果产生的一阶和二阶矩的多元正态观测的样本协方差阵的子。这项工作的动机是这样一个事实,即这种未成年人出现在协方差阵在许多经典的多变量问题的约束的表达。

英文摘要:

For a random matrix following a Wishart distribution, we derive formulas for the expectation and the covariance matrix of compound matrices. The compound matrix of order $m$ is populated by all $m\times m$-minors of the Wishart matrix. Our results yield first and second moments of the minors of the sample covariance matrix for multivariate normal observations. This work is motivated by the fact that such minors arise in the expression of constraints on the covariance matrix in many classical multivariate problems.

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