Sort numeric factor levels by values

Factor variables with numbers as levels are alphabetically ordered by default, which requires rearrangements for various purposes, e.g. modelling or visualizations. This function re-orders levels of numeric factor variables numerically.

refactorNum(x, decreasing = FALSE)

Arguments

x

A factor variable with numeric values as levels

decreasing

Logical, should the levels sorted descendingly?

Value

A factor variable, with sorted numeric values as levels

Author

Jitao David Zhang <jitao_david.zhang@roche.com>

Examples

(nums <- factor(c("2","4","24","1","2","125","1","2","125")))
#> [1] 2   4   24  1   2   125 1   2   125
#> Levels: 1 125 2 24 4
(nums.new <- refactorNum(nums))
#> [1] 2   4   24  1   2   125 1   2   125
#> Levels: 1 2 4 24 125