Df $cumval <- ave(Df$val, Df$val, cumsum) Df[-3] -- David
> On Mar 10, 2014, at 1:57 AM, "Philip A. Viton" <vito...@osu.edu> wrote: > > > 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. ______________________________________________ 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.
