Try this:
positions - order(ranks)
On 8/10/07, Tom.O [EMAIL PROTECTED] wrote:
Hi
I have run into a problem and i wonder if anyone has a smart way of doing
this.
For example i have this data frame for 5 different test groups:
Res1 - c(1,5,4,-0.5,3)
Res2 - c(-1,8,2,0,3)
Mean - c(0.5,1,1.5,-.5,2)
MyFrame - data.frame(Res1,Res2,Mean,row.names=c(G1,G2,G3,G4,G5))
where the first two columns are the results of two different tests, the
third column is the mean of the group.
I want to order this data.frame by the combined rank of Res1 Res2, but
where weigths are assigned to the importeance av each column. Lets assume
that Res1 is twice as important and lower values rank better.
MyRanks-data.frame(Rank1=rank(MyFrame[,Res1]),Rank2=rank(MyFrame[,Res2]),CombR=2*rank(MyFrame[,Res1])+rank(MyFrame[,Res2]),row.names=c(G1,G2,G3,G4,G5))
Rank1 Rank2 CombR
G1 2 1 5
G2 5 515
G3 4 311
G4 1 2 4
G5 3 410
and the rank of the combined is 2,5,4,1,3 , but to be able to sort MyFrame
in that order I need to enter this vector of positions c(4,1,5,3,2) but do
anyone have a smart way of converting ranks to positions?
Tom
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