The Annals of Statistics
- Ann. Statist.
- Volume 40, Number 2 (2012), 1061-1073.
Estimation of means in graphical Gaussian models with symmetries
We study the problem of estimability of means in undirected graphical Gaussian models with symmetry restrictions represented by a colored graph. Following on from previous studies, we partition the variables into sets of vertices whose corresponding means are restricted to being identical. We find a necessary and sufficient condition on the partition to ensure equality between the maximum likelihood and least-squares estimators of the mean.
Ann. Statist. Volume 40, Number 2 (2012), 1061-1073.
First available in Project Euclid: 18 July 2012
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Gehrmann, Helene; Lauritzen, Steffen L. Estimation of means in graphical Gaussian models with symmetries. Ann. Statist. 40 (2012), no. 2, 1061--1073. doi:10.1214/12-AOS991. http://projecteuclid.org/euclid.aos/1342625461.