Mann Whitney U Formula. The result of performing a mann whitney u test is a u statistic. U1 n1n2 n1 n1 1 2 r1.
The test statistic for the mann whitney u test is denoted u and is the smaller of u 1 and u 2 defined below. If ties true default the ties correction factor is applied. Either of these two formulas are valid for the mann whitney u test.
Mwtest r1 r2 tails ties cont p value of the mann whitney u test for the samples contained in ranges r1 and r2 using the normal approximation.
The mann whitney u test is a nonparametric test that allows two groups or conditions or treatments to be compared without making the assumption that values are normally distributed. S x y 1 if y x 1 2 if y x 0 if y x. Where r 1 sum of the ranks for group 1 and r 2 sum of the ranks for group 2. Is this evidence in support of the null or research hypothesis.
