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In order to replace the NAs in a factor an additional level has to be defined first. This function does this and replaces the NAs by the given level.
NALevel(x, level)
the vector x with the NAs replaced by level
a vector which will be turned into a factor.
the name for the new level
Andri Signorell <andri@signorell.net>
factor, levels
factor
levels
x <- c(LETTERS[1:5], NA) table(NALevel(x, "something else"))
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