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...0% and group 2 60% tmp1 <- as.factor((runif (1000) <= 0.9)) tmp2 <- as.factor((runif (1000) <= 0.5)) mysuccess <- as.factor(c(tmp1, tmp2)) mygroup <- as.factor(c(rep (1,1000), rep (2,1000))) table (mysuccess, mygroup) chisq.test (mysuccess, mygroup) # p-value = < 2.2e-16 myrpart <- rpart (mysuccess ~ mygroup) myrpart # rpart does not provide splits !! If I change the parameter in the setting of group 2 to 0.3 from 0.6 rpart does return splits, i.e. change the line tmp2 <- as.factor((runif (1000) <= 0.6)) to tmp2 <- as.factor((runif (1000) <= 0.3))...