Wilcoxon Rank Sum Test W Statistic. The Wilcoxon sign test uses ranked or ordinal data. True location shift is not equal to 0 95 percent confidence interval.
Figure 7 Wilcoxon rank-sum test using normal approximation. The W is the Wilcoxon test statistic and is as the name says the sum of the ranks in one of both groups. Wilcoxon Signed Rank Test University of Minnesota Twin Cities School of Statistics Stat 5601 Rweb.
In some cases the version of W that R gives is also the valua of U.
May 04 2017 The test statistic for the Wilcoxon Signed Rank Test is W defined as the smaller of W sum of the positive ranks and W- sum of the negative ranks. The Wilcoxon rank-sum test statistic is the sum of the ranks for observations from one of the samples. 1 Introduction The Wilcoxon signed rank sum test is another example of a non-parametric or distribution free test see 21 The Sign Test. -85 -01 sample estimates.
