There are several, including F-max (ratio of largest variance to smallest variance), Levene's test (just an ANOVA on deviations (absolute or squared) of scores from their group means, O'Brien's test (also an ANOVA on transformed data), and others. Your stat package may well provide one as part of its ANOVA routine.
Why do you want to test for equality of variances? If it has anything to do with a homogeneity of variance assumption for another test you wish to conduct, then you are treading on thin ice. ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Karl L. Wuensch, Department of Psychology, East Carolina University, Greenville NC 27858-4353 Voice: 252-328-4102 Fax: 252-328-6283 [EMAIL PROTECTED] http://core.ecu.edu/psyc/wuenschk/klw.htm -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] Sent: Tuesday, July 29, 2003 11:24 AM To: [EMAIL PROTECTED] Subject: test for variance equality I have used an F test in the past to test for variance equality between 2 groups. Is there a test that I can use for 3 groups or more? Alex . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . ================================================================= . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
