## The Annals of Mathematical Statistics

- Ann. Math. Statist.
- Volume 42, Number 1 (1971), 355-360.

### Unbiasedness of Tests for Homogeneity of Variances

Arthur Cohen and William E. Strawderman

#### Abstract

Consider the classical homogeneity of variances model. That is, suppose we have a one way layout, with independent random samples of equal sizes in each column. We assume the samples are from normal populations with unknown means and unknown variances. We wish to test the hypothesis that all the variances are equal. R. V. Laue (1965) defined a two parameter family of statistics to test the homogeneity hypothesis. The family is defined as a function of the ratio of mean value functions of the sample variances. Included in the family are many of the well-known tests for homogeneity. In this paper we investigate which of the tests is unbiased. Although we are unable to resolve the question for every test in the family, we can demonstrate the unbiased character for several subfamilies, which include some of the better known tests.

#### Article information

**Source**

Ann. Math. Statist. Volume 42, Number 1 (1971), 355-360.

**Dates**

First available in Project Euclid: 27 April 2007

**Permanent link to this document**

http://projecteuclid.org/euclid.aoms/1177693520

**Digital Object Identifier**

doi:10.1214/aoms/1177693520

**Mathematical Reviews number (MathSciNet)**

MR275563

**Zentralblatt MATH identifier**

0218.62082

**JSTOR**

links.jstor.org

#### Citation

Cohen, Arthur; Strawderman, William E. Unbiasedness of Tests for Homogeneity of Variances. Ann. Math. Statist. 42 (1971), no. 1, 355--360. doi:10.1214/aoms/1177693520. http://projecteuclid.org/euclid.aoms/1177693520.