Mann Whitney U Test Equation. This indicates a two sided test. So for example one might compare the speed at which two different groups of people can run 100 metres where one group has trained for six weeks and the other has not.
The test statistic for the mann whitney u test is denoted u and is the smaller of u 1 and u 2 defined below. U i 1 n j 1 m s x i y j displaystyle u sum i 1 n sum j 1 m s x i y j with. G the number of groups of ties t.
J the number of tied ranks in group j note that the mann whitney u test is statistically equivalent to the wilcoxon rank sum test not to be confused with the wilcoxon signed rank sum test which is for paired data.
Is this evidence in support of the null or research hypothesis. J the number of tied ranks in group j note that the mann whitney u test is statistically equivalent to the wilcoxon rank sum test not to be confused with the wilcoxon signed rank sum test which is for paired data. The scores from both samples will be ranked together. Where r 1 sum of the ranks for group 1 and r 2 sum of the ranks for group 2.
