Hi,
I expect this is simple but havent found an answer looking on the
archives...
I want to convert NA (missing) to particular levels (nonmissing) in factor
vectors.
e.g. I know
> X <- c(1, 2, 3)
> summary(X)
Min. 1st Qu. Median Mean 3rd Qu. Max.
1.0 1.5 2.0 2.0 2.5 3.0
> X <- as.factor(X)
> summary(X)
1 2 3
1 1 1
> levels(X)
[1] "1" "2" "3"
> levels(X) <- c("A", NA, "B")
> summary(X)
A B NA's
1 1 1
But what if I want to turn the NA back into a level?
How do I do this?
Thanks, Jon
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