lolibility - 1 month ago 5x

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.

Source (Stackoverflow)

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