Invariant Distributions Associated with Matrix Laws Under Structural Symmetry
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Summary Let Y(n x m) be a random matrix in the space F n x m of real matrices having location-scale parameters (θ, Ω) such that (i) θ belongs to a linear subspace M of F n x m; (ii) the distribution L(Y) exhibits a type of structural symmetry; and (iii) a certain transformation T(Y) is translation-invariant with respect to M and is invariant under changes of scale. Then the distribution L{T(Y)} is invariant for all underlying symmetric distributions L(Y). The types of symmetry are spherical symmetry and symmetry under multiplication on the left by orthogonal and similar matrices; the scale changes are multiplication by a scalar and multiplication on the right by a non-singular matrix. Applications yield the invariance under structural symmetry of distributions usually associated with normal-theory inferences in multivariate regression analysis and in testing equality of dispersion matrices.