For example, if I know columns 1:4 are to be treated as factors, I can write
dat <- matrix(c(2,1,1,1, 1,1,1,1), 2, 4) D <- as.data.frame(dat)
# force all variables to be treated as binary .# regardless of the small data set D$V1 <- factor(D$V1, 1:2) D$V2 <- factor(D$V2, 1:2) D$V3 <- factor(D$V3, 1:2) D$V4 <- factor(D$V4, 1:2)
But how do I do this in general? What I would like to say is something like
Why not just
for (i in my.factor.columns) {
# D$Vi <- factor(D$Vi, 1:my.nlevels[i])
D[,i]<- factor(D[,i], 1:my.nlevels[i])
}
Robert
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