Suppose I have a dataframe beginning:
id yr val a 1950 1 b 1950 10 a 1951 2 I'm trying to produce a table of cumulative sums of val, disaggregated by id and then yr, so the result should begin id yr cumval a 1950 1 a 1951 3 b 1950 10 I've been trying to do this using "aggregate" and passing the function "cumsum," but I can't get it to work. Can someone tell me how to do this? Thanks! ------------------------ Philip A. Viton City Planning, Ohio State University 275 West Woodruff Avenue, Columbus OH 43210 vito...@osu.edu ______________________________________________ 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.
