search for: delta_hba1c

...former entry probably is the result of some stupid algorithmic twist in some software (take your guesses), I think that wilcox_exact in the coin package is superior by not assuming that data are to be tied when deemed close enough by some poor defined measure (but I'm biased). Try wilcox_test(delta_hba1c~as.factor(Treatment), data=U, distribution="exact") And wilcox_test(signif(delta_hba1c,3)~as.factor(Treatment), data=U, distribution="exact") Thanks to Torsten Hothorn for discussing this with me and for producing such a neat package (together with Kurt Hornik, Mark A. van de W...