Hi all.
I think it would be nice to be able to combine levels of a factor on
creation a la
x <- rep(0:5,5)
y <- factor(x,levels=0:5,labels=c('1','1',2:5)) ## (1)
y
[1] 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5
Levels: 1 1 2 3 4 5
I thougt this would (should?) create a factor with 5 levels, ie
combining 0 and 1 in x into one level in y.
I find it hard to predict the behavior of the following lines:
table(factor(y)) ## Odd ?
1 1 2 3 4 5
10 0 5 5 5 5
table(factor(factor(y))) ## This is what I want
1 2 3 4 5
10 5 5 5 5
It also seems strange that this should be the way to go:
levels(y) <- levels(y) ## Does what I want following (1) even tough
it appear to be a void statement?
y
y
[1] 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5 1 1 2 3 4 5
Levels: 1 2 3 4 5
Am I missing an important point about factors or the factor function?
steen
Steen Ladelund, statistician
+4543233275 [EMAIL PROTECTED]
Research Center for Prevention and Health
Glostrup University Hospital, Denmark
www.fcfs.kbhamt.dk
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