On 03/08/10 21:50, GL wrote:
If I have a column with 2 levels, but one level has no remaining
observations. Can I remove the level?
Like this?
d <- data.frame(a = factor(rep("A", 3), levels = c("A", "B")))
levels(d$a)
# [1] "A" "B"
d$a <- d$a[,drop=TRUE]
levels(d$a)
# [1] "A"
Hope this helps
Allan
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