Dear Group, I have the following dataset: ID REPI DV CONC SS 1 1 156.84 116 0 1 2 146.56 116 0 1 3 115.13 116 0 1 4 207.81 116 0 1 5 129.53 116 0 1 6 151.48 116 0 1 7 158.95 116 0 1 8 192.37 116 0 1 9 32.97 116 0 1 10 151.66 116 0
I want to calculate the percentile of each CONC within ID=i and add as a column "Percentile". I got some help from R-tutorial on percentile but I am not able loop the function to calculate percentile/individual. So, I want the calculation to include only the ID=1 DVs to calculate the pecentile of conc=116. I truly appreciate your help. Regards, Ayyappa [[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.