Hello R User, In the sample data given below, time is recorded for each id subsequently. For the analysis, for each id, I would like to set 1st recorded time to zero and thereafter find the difference from previous time. I.e. for ID==1, I would like to see Time=0,3,1,3,6. This needs to be implemented to big data set. Any suggestions are much appreciated! Thanks, Bibek
ID Time 1 3 1 6 1 7 1 10 1 16 2 12 2 18 2 19 2 25 2 28 2 30 ______________________________________________ [email protected] 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.
