Factor: NA is "Missing" level

Assign the value "Missing" to missing values of a factor. Built as [addNA()].

add_missing(x, missing_lvl = "Missing")

Arguments

x

(`factor`)
missing_lvl

(`character`)

Examples


animals <- as.factor(c("cat", "dog", NA))
animals

#> [1] cat  dog  <NA>
#> Levels: cat dog
add_missing(animals)

#> [1] cat     dog     Missing
#> Levels: cat dog Missing