Greetings R users, My goal is to generate quartile groups of each variable in my data set. I would like each experiment to have its designated group added as a subsequent column. I can accomplish this individually with the following code:
brks <- with(data_variables, cut2(var2, g=4)) #I don't want the actual numbers, I need a numbered group data$test1=factor(brks, labels=1:4) However, I cannot get a loop to work nor can I get a loop to add the columns with an appropriate name (ex. quartile_variable). I have tried multiple different ways but can't seem to get it to work. I think it would begin something like this: for(i in 11:ncol(survival_data_variables)){ brks=as.data.frame(with(survival_data_variables, cut2(survival_data_variables[,i], g=4))) Any assistance would be sincerely appreciated. I would like the final data set to have the following layout: ID var1 var2 var3 var4 quartile var1 quartile var2 quartile var3 quartile var4 Here is a subset of my data to work with: structure(list(ID = c(11112L, 11811L, 12412L, 12510L, 13111L, 20209L, 20612L, 20711L, 21510L, 22012L), var1 = c(106, 107, 116, 67, 76, 146, 89, 62, 65, 116), var2 = c(0, 0, 201, 558, 526, 555, 576, 0, 531, 649), var3 = c(70.67, 81.33, 93.67, 84.33, 52, 74, 114, 101, 80.33, 91.33), var4 = c(136, 139, 142, 138, 140, 140, 136, 139, 140, 139)), .Names = c("ID", "var1", "var2", "var3", "var4"), row.names = c(NA, 10L), class = "data.frame") Regards, Charles [[alternative HTML version deleted]] ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.