Thank you. It seems that nobody has implemented it in R yet. I'll have a look, thank you very much

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.lamprianou@manchester.ac.uk

--- On Tue, 31/8/10, JLucke@ria.buffalo.edu <JLucke@ria.buffalo.edu> wrote:

From: JLucke@ria.buffalo.edu <JLucke@ria.buffalo.edu>
Subject: Re: [R] Brown-Forsythe test of equality of MEANS
To: "Iasonas Lamprianou" <lamprianou@yahoo.com>
Cc: r-help@r-project.org, r-help-bounces@r-project.org
Date: Tuesday, 31 August, 2010, 20:26



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 <lamprianou@yahoo.com>


Sent by: r-help-bounces@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.lamprianou@manchester.ac.uk









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