Make missing values explicit

This gives missing value an explicit factor level, ensuring that they appear in summaries and on plots.

fct_explicit_na(f, na_level = "(Missing)")

Arguments

f	A factor (or character vector).
na_level	Level to use for missing values.

Examples

f1 <- factor(c("a", "a", NA, NA, "a", "b", NA, "c", "a", "c", "b"))
table(f1)
#> f1
#> a b c 
#> 4 2 2 

f2 <- fct_explicit_na(f1)
table(f2)
#> f2
#>         a         b         c (Missing) 
#>         4         2         2         3