a summary function that is applied to the groups of
X
(as determined by
Factor ).
The values of this summary function, in ascending order,
are used to rearrange the levels of
Factor.
...
any other arguments to be passed into
Function.
VALUE:
an ordered factor like
Factor but with a rearranged
levels attribute.
The reordered factor is often useful for making plots more
meaningful.
SEE ALSO:
,
.
EXAMPLES:
# make the shorter singers first
reorder.factor(singer$voice.part, singer$height)
# make the taller singers first
reorder.factor(singer$voice.part, singer$height, function(x) -mean(x))
# or
reorder.factor(singer$voice.part, -singer$height)
# the definition of the function is relatively simple
reorder.factor <- function(Factor, X, Function = mean, ...)
ordered(Factor,
levels(Factor)[order(tapply(X, Factor, Function, ...))])