On 13 Aug 03, at 11:26, Harold Doran wrote: > I believe it is in the Rcmdr package, which requires the car library to be loaded. > > You can also perform an ANOVA using the absolute value of the deviations from each > respective group mean, which is what Levene's Test does. >
The function just posted by John Fox (and originally by Brian Ripley) is a much better idea. In particular, using absolute deviations from the group means is a poor idea, as the performance of the resulting test is strongly dependent on population shape. A good reference is Carroll, R. J. & Schneider H., Statistics & Probability Letters, 1985, 3, 191-194. ---JRG > > ------ > Harold C. Doran > Director of Research and Evaluation > New American Schools > 675 N. Washington Street, Suite 220 > Alexandria, Virginia 22314 > 703.647.1628 > <http://www.edperform.net> > > > > > -----Original Message----- > From: Haynes, Maurice (NIH/NICHD) [mailto:[EMAIL PROTECTED] > Sent: Wednesday, August 13, 2003 10:40 AM > To: 'r-help' > Subject: [R] Levene test of homogeneity of variance > > > Has the Levene test of homogeneity of variance been implemented in any > library in R? > > Thanks, > > Maurice Haynes > National Institute of Child Health and Human Development > Child and Family Research Section > 6705 Rockledge Drive > Bethesda, MD 20892 > Voice: 301-496-8180 > Fax: 301-496-2766 > E-Mail: [EMAIL PROTECTED] > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help > > ______________________________________________ > [EMAIL PROTECTED] mailing list > https://www.stat.math.ethz.ch/mailman/listinfo/r-help John R. Gleason Syracuse University 430 Huntington Hall Voice: 315-443-3107 Syracuse, NY 13244-2340 USA FAX: 315-443-4085 PGP public key at keyservers ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help