[SciPy-user] help with scipy.stats.mannwhitneyu
Thu Feb 5 10:32:51 CST 2009
Stéfan van der Walt wrote:
> 2009/2/5 Sturla Molden <email@example.com>:
>> On 2/5/2009 4:36 PM, firstname.lastname@example.org wrote:
>>> According to wikipedia, Mann-Whitney-U is the Wilcoxon rank-sum test
>>> for independent samples, just a different name.
>> You should not trust Wikipedia.
> Or, you can fix the entry on Wikipedia...
> SciPy-user mailing list
Or perhaps it is actually correct. My understanding (because I don't
want to do it) is that these are equivalent and all major stats packages
provide just one test. For example, Prof Brian Ripley's reply on the R list
>/ I am hoping someone could shed some light into the Wilcoxon Rank Sum Test
/>/ for me? In looking through Stats references, the Mann-Whitney U-test and
/>/ the Wilcoxon Rank Sum Test are statistically equivalent.
Yes, but not numerically: they differ by a constant (in the data, a
function of the data size).
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