Drop unused levels in a factor
object to be processed
should factor levels be reordered using
additional arguments to
drop.levels is a generic function, where default method does
nothing, while method for factor
s drops all unused levels. Drop
is done with
There are also convenient methods for
where all unused levels are dropped in all factors (one by one) in a
list or a
Input object without unused levels.
Jim Rogers [email protected] and Gregor Gorjanc
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