#### Document Type

Article

#### Publication Date

1997

#### DOI

10.1016/s0024-3795(97)00032-3

#### Publication Title

Linear Algebra and Its Applications

#### Volume

264

#### Pages

421-437

#### Abstract

Let **A** be a symmetric matrix and **B** be a nonnegative definite (nnd) matrix. We obtain a characterization of the class of nnd solutions **Σ** for the matrix equation **AΣA** **= B**. We then use the characterization to obtain all possible covariance structures under which the distributions of many common test statistics remain invariant, that is, the distributions remain the same except for a scale factor. Applications include a complete characterization of covariance structures such that the chisquaredness and independence of quadratic forms in ANOVA problems is preserved. The basic matrix theoretic theorem itself is useful in other characterizing problems in linear algebra. © 1997 Elsevier Science Inc.

#### Original Publication Citation

Chaganty, N. R., & Vaish, A. K. (1997). An invariance property of common statistical tests.* Linear Algebra and Its Applications, 264*, 421-437. doi:10.1016/s0024-3795(97)00032-3

#### Repository Citation

Chaganty, N. Rao and Vaish, A. K., "An Invariance Property of Common Statistical Tests" (1997). *Mathematics & Statistics Faculty Publications*. 90.

https://digitalcommons.odu.edu/mathstat_fac_pubs/90

## Comments

Elsevier open archive. © 1997 Elsevier Science Inc. All rights reserved.