[R] Mann-Whitney by group

David L Carlson dcarlson at tamu.edu
Fri Jul 6 18:21:47 CEST 2012

Can you describe how your data is organized. It is clear there are eight
columns, but it is not clear how the groups are represented, a Group column
or do the groups have to be assembled from information in another column (a
column with CD8.14, etc)? Create a small version of the data and use dput()
to create a readable version that can be pasted into a plain text email
(don't use html) usually results in a faster response.

David L Carlson
Associate Professor of Anthropology
Texas A&M University
College Station, TX 77843-4352

> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-
> project.org] On Behalf Of David Chertudi
> Sent: Friday, July 06, 2012 9:15 AM
> To: r-help at r-project.org
> Subject: [R] Mann-Whitney by group
> Hello,
> I'm having some issues grouping cases for some Mann-Whitney U tests I'm
> attempting to run. I'm willing to use wilcox.test if it'll work; I've
> also tried wilcox_test() from the "coin" package. Here's the deal: for
> each column (A through H), I would like to run the two-sample
> independent test, comparing Group 5 (CD8.14 through CD8.17) to Group 6
> (CD8.18 through CD8.21). So, for A, test Group 5 agains Group 6, for B,
> test Group 5 against Group 6, and so on. I'm sure this is basic, but
> thank you in advance for any help you can provide.
>  All the best,
> David
> 	[[alternative HTML version deleted]]
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