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