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, ...)
"reorder"(x, X, FUN = mean, ..., 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 ofx
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 ofx
.  ...
 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")
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