Re: [R] how to check if a variable is preferentially present in a sample

Hi Tania, I think it could be. I tried a solution based on your data set using a chi-squared approach. Here is what I got: # # Data set set.seed(123) d <- data.frame(cbind(val=rnorm(1:10)^2, group=sample(LETTERS[1:5],100,repl=TRUE))) d[,"val"]<-as.numeric(as.character(d$val)) #

[R] how to check if a variable is preferentially present in a sample

Dear All, I do apologise if this question is out of place for this list but I've tried searching mailing lists and read "Introductory Statistics with R" by Peter Dalgaard, but couldn't find any hints on solving my question below: I have a data frame (d) of values which I will rank in decrea