Reorder factor levels by first appearance, frequency, or numeric order

This family of functions changes only the order of the levels.

• fct_inorder(): by the order in which they first appear.

• fct_infreq(): by number of observations with each level (largest first)

• fct_inseq(): by numeric value of level.

fct_inorder(f, ordered = NA)

fct_infreq(f, w = NULL, ordered = NA)

fct_inseq(f, ordered = NA)

Arguments

f

A factor

ordered

A logical which determines the "ordered" status of the output factor. NA preserves the existing status of the factor.

w

An optional numeric vector giving weights for frequency of each value (not level) in f.

Examples

f <- factor(c("b", "b", "a", "c", "c", "c"))
f
#> [1] b b a c c c
#> Levels: a b c
fct_inorder(f)
#> [1] b b a c c c
#> Levels: b a c
fct_infreq(f)
#> [1] b b a c c c
#> Levels: c b a

f <- factor(1:3, levels = c("3", "2", "1"))
f
#> [1] 1 2 3
#> Levels: 3 2 1
fct_inseq(f)
#> [1] 1 2 3
#> Levels: 1 2 3