[SciPy-user] scipy.stats.stats mannwhitneyu vs ranksums?

David Warde-Farley dwf@cs.toronto....
Thu Jul 2 18:54:33 CDT 2009


There's also wilcoxon, which is related but subtly different. There's  
an open ticket for clarifying these docs:

	http://projects.scipy.org/scipy/ticket/901

The discussion there might illuminate things.

David

On 2-Jul-09, at 1:43 PM, Elias Pampalk wrote:

> Why does stats.py contain both mannwhitneyu and ranksums?
>
> See also:
> http://en.wikipedia.org/wiki/Mann-Whitney-Wilcoxon_test
>
> "Mann-Whitney U test (also called the Mann-Whitney-Wilcoxon (MWW),  
> Wilcoxon
> rank-sum test, or Wilcoxon-Mann-Whitney test)"
>
> http://www.mathworks.com/access/helpdesk/help/toolbox/stats/index.html?/acce
> ss/helpdesk/help/toolbox/stats/ranksum.html
>
> "ranksum [...] The test is equivalent to a Mann-Whitney U-test."
>
> Thanks,
> Elias
>
> PS. @David, @Pauli: Thank you for answering my question wrt  
> documentation
> yesterday!
>
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