Replace labels for unknown with NA
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Either a factor created with
Further arguments passed to or from other methods.
String giving the XML name of the NAACCR field to code.
x was a
factor, then the result is a vector with the
x, except all levels which effectively mean "unknown" are
The returned factor won't have those in its levels, either.
x is a
naaccr_record object, then the result is the
naaccr_record created by applying this function to all columns of
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