Talk:Mann-Whitney U
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can anyone typeset the formulae better? I am not familiar with Tex. seglea 05:39, 17 Jan 2004 (UTC)
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[edit] Ambiguity in the direct method
The second point of the direct method should better be: "Taking each observation in sample 1, count the number of observations in sample 2 that are GREATER than it." In the example with the tortoises, we see that for each tortoise, we count hares with a greater rank (or time) in the race, not smaller. Am I wrong? --Jgiard 10:07, 5 December 2006 (UTC)
[edit] P value
I beleive that one cannot interpret results from this test with out understanding the P-value. As I understand it the smaller the P value the more different the two populations are. What I would like to know if there is a critical value like there is with a T-test? Thanks ADS
[edit] Inexact explanation of what this test should be used for
A significant MW tests does not necessarily imply that the distributions have different medians. This is a common misconception. It is most powerful for detecting a difference in medians, which is why this is commonly misstated. The MW tests that the samples were taken from different distributions.
161.130.68.84 21:11, 28 December 2006 (UTC)JWD
[edit] Introduction requires clarity
These two statements are not equivelent
- It requires the two samples to be independent, and the observations to be ordinal or continuous measurements
- i.e. one can at least say, of any two observations, which is the greater.
