Type ?rank
in the prompt and look at the ties.method argument. Best, Daniel ------------------------- cuncta stricte discussurus ------------------------- -----Original Message----- From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On Behalf Of MRKidd Sent: Friday, January 08, 2010 4:09 PM To: r-help@r-project.org Subject: [R] A better way to Rank Data that considers "ties" This will start off sounding very easy, but I think it will be very complicated. Let's say that I have a matrix, which shows the number of apples that each person in a group has. OriginalMatrix<-matrix(c(2,3,5,4,6),nrow=5,ncol=1,byrow=T,dimnames=list(c("B ob","Frank","Joe","Jim","David"),c("Apples"))) Apples Bob 2 Frank 3 Joe 5 Jim 4 David 6 I want to add a third column that shows what each person's rank is - e.g. David is number 1 because he has the most apples. So this is what I want: Apples Rank Bob 2 5 Frank 3 4 Joe 5 2 Jim 4 3 David 6 1 I have managed to do this in the following steps: Unranked<-rownames(OriginalMatrix) Ranked<-names(sort(OriginalMatrix,decreasing=T)) Matched<-match(Unranked,Ranked) NewMatrix<-cbind(OriginalMatrix,Matched) This is not acceptable, however, if two people have the same number of apples. You will get: NewMatrix Apples Rank Bob 2 5 Frank 2 4 Joe 5 2 Jim 4 3 David 6 1 Does anyone know of a way to make it so that both Bob and Frank will be ranked as fourth (i.e.- tied for last place)? -- View this message in context: http://n4.nabble.com/A-better-way-to-Rank-Data-that-considers-ties-tp1009994 p1009994.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.
