Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: 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.

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The categories of this paper are: physics
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The categories of this paper are: hep-ex
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The categories of this paper are: hep-lat
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: math-ph
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The categories of this paper are: solv-int
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The categories of this paper are: acc-phys
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The categories of this paper are: cs
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The categories of this paper are: dg-ga
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The categories of this paper are: astro-ph
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The categories of this paper are: ao-sci
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The categories of this paper are: nlin
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
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The categories of this paper are: comp-gas