# reorder.default

##### Reorder Levels of a Factor

`reorder`

is a generic function. The `"default"`

method
treats its first argument as a categorical variable, and reorders its
levels based on the values of a second variable, usually numeric.

- Keywords
- utilities

##### Usage

`reorder(x, ...)`## S3 method for class 'default':
reorder(x, X, FUN = mean, \dots,
order = is.ordered(x))

##### Arguments

- x
- An atomic vector, usually a factor (possibly ordered). The vector
is treated as a categorical variable whose levels will be reordered.
If
`x`

is not a factor, its unique values will be used as the implicit levels. - X
- a vector of the same length as
`x`

, whose subset of values for each unique level of`x`

determines the eventual order of that level. - FUN
- a function whose first argument is a vector and
returns a scalar, to be applied to each subset of
`X`

determined by the levels of`x`

. - ...
- optional: extra arguments supplied to
`FUN`

- order
- logical, whether return value will be an ordered factor rather than a factor.

##### Value

- A factor or an ordered factor (depending on the value of
`order`

), with the order of the levels determined by`FUN`

applied to`X`

grouped by`x`

. The levels are ordered such that the values returned by`FUN`

are in increasing order. Empty levels will be dropped.Additionally, the values of

`FUN`

applied to the subsets of`X`

(in the original order of the levels of`x`

) is returned as the`"scores"`

attribute.

##### See Also

##### Examples

`library(stats)`

```
require(graphics)
bymedian <- with(InsectSprays, reorder(spray, count, median))
boxplot(count ~ bymedian, data = InsectSprays,
xlab = "Type of spray", ylab = "Insect count",
main = "InsectSprays data", varwidth = TRUE,
col = "lightgray")
```

*Documentation reproduced from package stats, version 3.3, License: Part of R 3.3*

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