| reorder.factor {stats} | R Documentation |
reorder is a generic function. Its "factor" method
reorders the levels of a factor depending on values of a second
variable, usually numeric.
reorder(x, ...)
## S3 method for class 'factor':
reorder(x, X, FUN = mean, ...,
order = is.ordered(x))
x |
a factor (possibly ordered) whose levels will be reordered. |
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. |
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.
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.
Deepayan Sarkar deepayan@stat.wisc.edu
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")