allNA
tests if all elements are NA, and includeNA
sets the
NA
s in a character vector or factor to an explicit label.
allNA(x)includeNA(x, label, ...)
# S3 method for factor
includeNA(x, label = "(Missing)", first = FALSE, ...)
# S3 method for default
includeNA(x, label = "(Missing)", ...)
An object
A character string denoting the label to set NA
s to.
Other arguments (not in use at this time).
Logical; should the new label be the first level?