lolibility - 8 months ago 51

R Question

I have a data set and one of its column has factor levels

`"a" "b" "c" "NotPerformed"`

`"NotPerformed"`

Answer

Set the level to NA:

```
x <- factor(c("a", "b", "c", "NotPerformed"))
x
## [1] a b c NotPerformed
## Levels: a b c NotPerformed
levels(x)[levels(x)=='NotPerformed'] <- NA
x
## [1] a b c <NA>
## Levels: a b c
```

Note that the factor level is removed.