Returns (at least) factors of !NA and NA, where !NA indicates a datum that is not missing, and NA indicates missingness. It also allows you to specify some new missings, if you like. This function is what powers the factor levels in as_shadow().

shade(x, ..., extra_levels = NULL)



a vector


additional levels of missing to add


extra levels you might to specify for the factor.


df <- tibble::tribble( ~wind, ~temp, -99, 45, 68, NA, 72, 25 ) shade(df$wind)
#> [1] !NA !NA !NA #> Levels: !NA NA
shade(df$wind, inst_fail = -99)
#> [1] NA_inst_fail !NA !NA #> Levels: !NA NA NA_inst_fail