Add extra level to factors in dataframe

Question

I have a data frame with numeric and ordered factor columns. I have lot of NA values, so no level is assigned to them. I changed NA to \"No Answer\", but levels of the facto

Answer 1

Since this question was last answered this has become possible using fct_explicit_na() from the forcats package. I add here the example given in the documentation.

f1 <- factor(c("a", "a", NA, NA, "a", "b", NA, "c", "a", "c", "b"))
table(f1)

# f1
# a b c 
# 4 2 2 

f2 <- forcats::fct_explicit_na(f1)
table(f2)

# f2
#     a         b         c (Missing) 
#     4         2         2         3 

Default value is (Missing) but this can be changed via the na_level argument.