[R] Interpreting the result of a Wilcoxon (Mann-Whitney U) test

S Ellison S.Ellison at lgcgroup.com
Thu Oct 3 13:05:29 CEST 2013

> I'm having some trouble interpreting the results of a Wilcoxon
> (Mann-Whitney U) test. Hope you can help.

Two-tailed and one tailed tests generally give different p-values, with the two-tailed p-value twice (one of) the one-tailed values for rather obvious reasons. You need to sort out which question you wanted the answer to.

Having said that, if a factor of two in the p-value changes your interpretation, you probably haven't got a really compelling result.

S Ellison

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