HI,
Not sure if this is what you meant. tapply(iris$Sepal.Length,iris$Species,FUN=function(x) sum(x)/sum(iris$Sepal.Length)*100) # setosa versicolor virginica # 28.55676 33.86195 37.58129 A.K. ----- Original Message ----- From: Karine Charlebois <karine.charleb...@outlook.com> To: "r-help@r-project.org" <r-help@r-project.org> Cc: Sent: Tuesday, January 15, 2013 9:30 PM Subject: [R] Get a percent variable based on group Dear all, I'd like to get a percentage variable based on a group, but without creating a new data frame. For example: data(iris) iris$percent <-unlist(tapply(iris$Sepal.Length,iris$Species,function(x) x/sum(x, na.rm=TRUE))) This does not work, I should have only three standard values, respectively for setosa, versicolor, and virginica. How can I do this? MANY THANKS, Karine [[alternative HTML version deleted]] ______________________________________________ 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.
