# Wilcoxon Mann-Whitney Rank Sum Test

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## Wilcoxon Mann-Whitney Rank Sum Test

 Does anybody know what is relation between 'T' value calculated by 'wilcox_test' function (coin package) and more common 'W' value? Jarek Tuszynski >library(coin) > ### Tritiated Water Diffusion Across Human Chorioamnion > ### Hollander & Wolfe (1999), Table 4.1, page 110 > water_transfer <- data.frame( +     pd = c(0.80, 0.83, 1.89, 1.04, 1.45, 1.38, 1.91, 1.64, 0.73, 1.46, +            1.15, 0.88, 0.90, 0.74, 1.21), +     age = factor(c(rep("At term", 10), rep("12-26 Weeks", 5)))) > > ### Wilcoxon-Mann-Whitney test, cf. Hollander & Wolfe (1999), page 111 > ### exact p-value and confidence interval for the difference in location > ### (At term - 12-26 Weeks) > wt <- wilcox_test(pd ~ age, data = water_transfer, distribution = "exact", conf.int = TRUE) > print(wt)         Exact Wilcoxon Mann-Whitney Rank Sum Test data:  pd by groups 12-26 Weeks, At term T = -1.2247, p-value = 0.2544 alternative hypothesis: true mu is not equal to 0 95 percent confidence interval:  -0.76  0.15 sample estimates: difference in location                 -0.305         [[alternative HTML version deleted]] ______________________________________________ [hidden email] mailing list https://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html