[IPAC-List] Seeking a statistical test of variances

Dennis Doverspike dd1 at uakron.edu
Fri Dec 4 10:12:33 EST 2009


Not sure what you are testing or why - but there are of course quite a few

I found this write up on the web making suggestions - but a stat book would
show you other ones

Levene's test ( Levene 1960) is used to test if k samples have equal
variances. Equal variances across samples is called homogeneity of variance.
Some statistical tests, for example the analysis of variance, assume that
variances are equal across groups or samples. The Levene test can be used to
verify that assumption. Levene's test is an alternative to the Bartlett
test. The Levene test is less sensitive than the Bartlett test to departures
from normality. If you have strong evidence that your data do in fact come
from a normal, or nearly normal, distribution, then Bartlett's test has
better performance.

Dennis Doverspike, Ph.D., ABPP
Professor of Psychology
Director, Center for Organizational Research
Senior Fellow of the Institute for Life-Span Development and Gerontology
Psychology Department
University of Akron
Akron, Ohio 44325-4301
330-972-8372 (Office)
330-972-5174 (Office Fax)
ddoverspike at uakron.edu

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-----Original Message-----
From: ipac-list-bounces at ipacweb.org [mailto:ipac-list-bounces at ipacweb.org]
On Behalf Of Joel Wiesen
Sent: Friday, December 04, 2009 9:46 AM
To: IPAC-List at ipacweb.org
Subject: Re: [IPAC-List] Seeking a statistical test of variances


I'm looking for a test that would work with non-normal distributions,
such as age.



- -
Joel P. Wiesen, Ph.D., Director
Applied Personnel Research
62 Candlewood Road
Scarsdale, NY 10583-6040
(617) 244-8859

Joel Wiesen wrote:

> Seeking the name of a statistical test that can be used to test a null

> hypothesis of equal variances in N groups.


> Thanks.


> Joel



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