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
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