The following reference that contains a short Fortran program for the
Brown-Forsythe ANOVA
Reed, James F., I. & Stark, D. B.
Robust alternatives to traditional analyses of variance: Welch $W^*$,
James $J_I^*$, James $J_II^*$, and Brown-Forsythe $BF^*$
Computer Methods and Programs in Biomedicine, 1988, 26, 233-238
Iasonas Lamprianou <lampria...@yahoo.com>
Sent by: r-help-boun...@r-project.org
08/30/2010 04:05 PM
To
r-help@r-project.org
cc
Subject
[R] Brown-Forsythe test of equality of MEANS
Dear friends,
two years ago (as I found on the web) Paul sent the following message but
I was not able to find if he got an answer. Today I have the same question
and it would be great if I could find out that this test has been
implemented (somehow) in R. Please do not confuse it with the
Brown-Forsythe test of equality of variances. Thank you:
I've been searching around for a function for computing the Brown-Forsythe
F* statistic which is a substitute for the normal ANOVA F statistic for
when there are unequal variances, and when there is evidence of
non-normality. A couple of other people have asked this question, the
responses I found have been:
?oneway.test
However, that function appears to use the Welch W statistic which, while
good at handling unequal variances, is not as good as F* at handling
non-normal distributions (or so my textbook tells me). So, two questions:
1. Is there a function ready to use for calculating the Brown-Forsythe
F*?
2. If not, what do people use for checking the results of a (one-way)
ANOVA when there is non-normality as well as non-constant variances?
Thanks,
Dr. Iasonas Lamprianou
Assistant Professor (Educational Research and Evaluation)
Department of Education Sciences
European University-Cyprus
P.O. Box 22006
1516 Nicosia
Cyprus
Tel.: +357-22-713178
Fax: +357-22-590539
Honorary Research Fellow
Department of Education
The University of Manchester
Oxford Road, Manchester M13 9PL, UK
Tel. 0044 161 275 3485
iasonas.lampria...@manchester.ac.uk
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide
http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
[[alternative HTML version deleted]]
______________________________________________
R-help@r-project.org mailing list
https://stat.ethz.ch/mailman/listinfo/r-help
PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.
