Try this. The first line appends the cumulative sum column and the second displays it in sorted fashion:
DF$cumQuantity <- ave(DF$Quantity, DF$State, DF$Gender, FUN = cumsum) DF[order(DF$State, DF$Gender), ] On Sun, Nov 16, 2008 at 9:12 PM, jeffc <[EMAIL PROTECTED]> wrote: > > Hi, > > I have a data set similar to the following > > State Gender Quantity > TX Male 1 > NY Female 2 > TX Male 3 > NY Female 4 > > > I need to calculate cumulative sum of the quantity by State and Gender. The > expected output is > State Gender Quantity CumQuantity > TX Male 1 1 > TX Male 3 4 > NY Female 2 2 > NY Female 4 6 > > I highly appreciate if someone can give me some hints on solving that in R. > > Hao > > -- > View this message in context: > http://www.nabble.com/how-to-calculate-another-vector-based-on-the-data-from-a-combination-of-two-factors-tp20532749p20532749.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. > ______________________________________________ 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.