Gabor Grothendieck wrote:
I am happy to answer posts to r-help regardless of the name and email
address of the poster but would draw the line at someone excessively
posting without a reasonable effort to find the answer first or using
it for homework since such requests could flood the list making it
useless for everyone.
Gabor I respectfully disagree. It is bad practice to allow anonymous
postings. We need to see real names and real affiliations.
r-help is starting to border on uselessness because of the age old
problem of the same question being asked every two days, a high
frequency of specialty questions, and answers given with the best of
intentions in incremental or contradictory e-mail pieces (as opposed to
a cumulative wiki or hierarchically designed discussion web forum), as
there is no moderator for the list. We don't need even more traffic
from anonymous postings.
Frank
On Fri, Mar 5, 2010 at 10:55 AM, Ravi Varadhan <rvarad...@jhmi.edu> wrote:
David,
I agree with your sentiments. I also think that it is bad posting etiquette not to sign
one's genuine name and affiliation when asking for help, which "blue sky" seems
to do a lot. Bert Gunter has already raised this issue, and I completely agree with him.
I would also like to urge the R-gurus to ignore such postings.
Best,
Ravi.
____________________________________________________________________
Ravi Varadhan, Ph.D.
Assistant Professor,
Division of Geriatric Medicine and Gerontology
School of Medicine
Johns Hopkins University
Ph. (410) 502-2619
email: rvarad...@jhmi.edu
----- Original Message -----
From: David Winsemius <dwinsem...@comcast.net>
Date: Friday, March 5, 2010 9:25 am
Subject: Re: [R] Nonparametric generalization of ANOVA
To: blue sky <bluesky...@gmail.com>
Cc: r-h...@stat.math.ethz.ch
On Mar 5, 2010, at 8:19 AM, blue sky wrote:
> My interpretation of the relation between 1-way ANOVA and Wilcoxon's
> test (wilcox.test() in R) is the following.
>
> 1-way ANOVA is to test if two or multiple distributions are the same,
> assuming all the distributions are normal and have equal variances.
> Wilcoxon's test is to test two distributions are the same without
> assuming what their distributions are.
>
> In this sense, I'm wondering what is the generalization of Wilcoxon's
> test to more than two distributions. And, more general, what is the
> generalization of Wilcoxon's test to multi-way ANOVA with arbitrary
> complex model formula? What are the equivalent F statistics and t
> statistics in the generalization of Wilcoxon's test?
>
> Note that I'm not interested in looking for a specific nonparametric
> test for a particular dataset right now, although this is important
in
> practice. What I'm interested the general nonparametric statistical
> framework that parallels ANOVA. Could somebody give some hints on what
> references I should look for? I have google searched this topic, but
> don't find a page that exactly answered my question.
This is your first of three postings in the last hour and they are
all
in a category that could well be described as requests for tutoring
in
basic statistical topics. I am of the impression you have been
requested not to engage in such behavior on this list. For this
question for instance there is an entire CRAN Task View available and
you have been in particular asked to sue such resource before posting.
It's not the described role of the r-help list to remediate your lack
of statistical background, but rather to deal with difficulties in
applying the R-language to particular, discrete and exemplified
problems.
--
David Winsemius, MD
West Hartford, CT
______________________________________________
R-help@r-project.org mailing list
PLEASE do read the posting guide
and provide commented, minimal, self-contained, reproducible code.
______________________________________________
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.
______________________________________________
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.
--
Frank E Harrell Jr Professor and Chairman School of Medicine
Department of Biostatistics Vanderbilt University
______________________________________________
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.
