hello, I have the following data manipulation issue. the following is the sample data:
value level 4 A 5 A 2 A 10 B 9 B 34 B 100 C 34 C 101 C. I hope to get the following result: value level rank 2 A 1 4 A 2 5 A 3 9 B 1 10 B 2 34 B 3 34 C 1 100 C 2 101 C. 3 as you may see, I need the data sorted and indexed within each level of "level". what do I need to do calculate the rank variable? thanks, -- View this message in context: http://r.789695.n4.nabble.com/how-to-add-row-index-based-a-categorical-column-tp3556126p3556126.html Sent from the R help mailing list archive at Nabble.com. ______________________________________________ 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.
