[R] A better way to Rank Data that considers "ties"
MRKidd
clistkoraelus at yahoo.com
Fri Jan 8 22:09:08 CET 2010
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("Bob","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)?
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