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...ng that IPPO is my data frame and IPPOBIS is the subset my variable still have 3 different levels and the function wilcox_test (package "coin") does not accept it. I do not know how to overcome this problem. ippo <- c(rep("A",10),rep("B",10),rep("C",10)) ippo2 <- c(rnorm(10,0,1),rnorm(10,10,10),rnorm(10,10,10)) IPPO <- data.frame(ippo,ippo2) IPPOBIS <- IPPO[IPPO$ippo == "A" | IPPO$ippo == "B",] wilcox_test(ippo2 ~ ippo,data=IPPOBIS,distribution=exact()) Error in check(itp) : 'object' does not represent a two sample...