Martin,

If I am not wrong the difference is that if you has two levels you get
U-test, and W-test for more than two levels. But the test is almost the
same.

cheers

milton



On Sat, Jul 11, 2009 at 2:13 PM, Martin Batholdy <batholdy@googlemail.com>wrote:

> Hi,
>
> I know that I can perform a Mann-Whitney U test with wilcox.test(x,y)
>
> But instead of an U-value I get a W-Value.
>
> Is it possible to change this?
>
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