Daniel Moreira wrote:
Rodrigo,
Wilcoxon?Mann?Whitney allows arbitrary sample sizes. It is an extension of
the original Wilcoxon test which only handles equal sample sizes.
________________________________________
Daniel Moreira, MD
I believe you'll find that the Wilcoxon 2-sample test always allowed for
unequal sample sizes. To be clear there is the Wilcoxon 2-sample test
(Wilcoxon-Mann-Whitney 2-sample rank-sum test, to be precise) and the
Wilcoxon signed-rank one sample test, usually used for paired data (in
which the sample sizes are equal by definition since with paired data we
subtract a f(pre) from f(post) where f is a suitable transformation for
the pre and post measurements from the same subject).
Frank
Research Associate
Duke University Medical Center
DUMC 2626, MSRB-I Room 455
571 Research Drive
Durham, North Carolina 27710
Telephone: (919) 681-7132
Fax: (919) 668-7093
E-mail: daniel.more...@duke.edu
Rodrigo Fernandes Ramalho <rof...@ig.com.br>
Sent by: r-help-boun...@r-project.org
02/14/2009 08:52 AM
To
r-help@r-project.org
cc
Subject
[R] Mann Whitney test
Hi,
I have a statistical question.
To apply the Mann Whitney test to compare a pair of vectors, they must to
have the same length ?
Thanks,
Rodrigo
[[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.
--
Frank E Harrell Jr Professor and Chair 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.
