Exercise

# Ordered factors (2)

`speed_vector`

should be converted to an ordinal factor since its categories have a natural ordering. By default, the function `factor()`

transforms `speed_vector`

into an unordered factor. To create an ordered factor, you have to add two additional arguments: `ordered`

and `levels`

.

```
factor(some_vector,
ordered = TRUE,
levels = c("lev1", "lev2" ...))
```

By setting the argument `ordered`

to `TRUE`

in the function `factor()`

, you indicate that the factor is ordered. With the argument `levels`

you give the values of the factor in the correct order.

Instructions

**100 XP**

From `speed_vector`

, create an ordered factor vector: `factor_speed_vector`

. Set `ordered`

to `TRUE`

, and set `levels`

to `c("slow", "medium", "fast")`

.