[R] Nonparametric generalization of ANOVA
Matthew Dowle
mdowle at mdowle.plus.com
Fri Mar 5 19:47:31 CET 2010
John,
So you want BlueSky to change their name to "Paul Smith" at "New York
University", just to give a totally random, false name, example, and then
you will be happy ? I just picked a popular, real name at a real, big
place. Are you, or is anyone else, going to check its real ?
We want BlueSky to ask great questions, which haven't been asked before,
and to follow the posting guide. If BlueSky improves the knowledge base
whats the problem? This person may well be breaking the posting guide for
many other reasons (I haven't looked), and if they are then you could take
issue with them on those points, but not for simply writing as "BlueSky".
David W has got it right when he replied to "ManInMoon". Shall we stop
this thread now, and follow his lead ? I would have picked "ManOnMoon"
myself but maybe that one was taken. Its rather difficult to be on a moon,
let alone inside it.
Matthew
"John Sorkin" <jsorkin at grecc.umaryland.edu> wrote in message
news:4B910687020000CB00064244 at medicine.umaryland.edu...
> The sad part of this interchanges is that Blue Sky does not seem to be
> amiable to suggestion. He, or she, has not taken note, or responded to the
> fact that a number of people believe it is good manners to give a real
> name and affiliation. My mother taught me that when two people tell you
> that you are drunk you should lie down until the inebriation goes away.
> Blue Sky, several people have noted that you would do well to give us your
> name and affiliation. Is this too much to ask given that people are good
> enough to help you?
> John
>
>
>
>
> John David Sorkin M.D., Ph.D.
> Chief, Biostatistics and Informatics
> University of Maryland School of Medicine Division of Gerontology
> Baltimore VA Medical Center
> 10 North Greene Street
> GRECC (BT/18/GR)
> Baltimore, MD 21201-1524
> (Phone) 410-605-7119
> (Fax) 410-605-7913 (Please call phone number above prior to faxing)>>>
> "Matthew Dowle" <mdowle at mdowle.plus.com> 3/5/2010 12:58 PM >>>
> Frank, I respect your views but I agree with Gabor. The posting guide
> does
> not support your views.
>
> It is not any of our views that are important but we are following the
> posting guide. It covers affiliation. It says only that "some" consider
> it
> "good manners to include a concise signature specifying affiliation". It
> does not agree that it is bad manners not to. It is therefore going too
> far
> to urge R-gurus, whoever they might be, to ignore such postings on that
> basis alone. It is up to responders (I think that is the better word
> which
> is the one used by the posting guide) whether they reply. Missing
> affiliation is ok by the posting guide. Users shouldn't be put off from
> posting because of that alone.
>
> Sending from an anonymous email address such as "BioStudent" is also fine
> by
> the posting guide as far as my eyes read it. It says only that the email
> address should work. I would also answer such anonymous posts, providing
> they demonstrate they made best efforts to follow the posting guide, as
> usual for all requests for help. Its so easy to send from a false, but
> apparently real name, why worry about that?
>
> If you disagree with the posting guide then you could make a suggestion to
> get the posting guide changed with respect to these points. But,
> currently,
> good and practice is defined by the posting guide, and I can't see that
> your
> view is backed up by it. In fact it seems to me that these points were
> carefully considered, and the wording is careful on these points.
>
> As far as I know you are wrong that there is no moderator. There are in
> fact an uncountable number of people who are empowered to moderate i.e.
> all
> of us. In other words its up to the responders to moderate. The posting
> guide is our guide. As a last resort we can alert the list administrator
> (which I believe is the correct name for him in that role), who has powers
> to remove an email address from the list if he thinks that is appropriate,
> or act otherwise, or not at all. It is actually up to responders (i.e.
> all
> of us) to ensure the posting guide is followed.
>
> My view is that the problems started with some responders on some
> occasions.
> They sometimes forgot, a little bit, to encourage and remind posters to
> follow the posting guide when it was not followed. This then may have
> encouraged more posters to think it was ok not to follow the posting
> guide.
> That is my own personal view, not a statistical one backed up by any
> evidence.
>
> Matthew
>
>
> "Frank E Harrell Jr" <f.harrell at vanderbilt.edu> wrote in message
> news:4B913880.9020701 at vanderbilt.edu...
>> 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 <rvaradhan at 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: rvaradhan at jhmi.edu
>>>>
>>>>
>>>> ----- Original Message -----
>>>> From: David Winsemius <dwinsemius at comcast.net>
>>>> Date: Friday, March 5, 2010 9:25 am
>>>> Subject: Re: [R] Nonparametric generalization of ANOVA
>>>> To: blue sky <bluesky315 at gmail.com>
>>>> Cc: r-help at 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 at r-project.org mailing list
>>>>>
>>>>> PLEASE do read the posting guide
>>>>> and provide commented, minimal, self-contained, reproducible code.
>>>> ______________________________________________
>>>> R-help at 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 at 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 at 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.
>
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