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Reverse the numeric values of a scale variable

Source: R/transform.R
make_rev.Rd

make_rev() reverses the direction of a numeric scale variable using the formula min(x) + max(x) - x. This preserves the scale range: a 1-4 scale reversed stays a 1-4 scale; a 2-5 scale reversed stays a 2-5 scale.

Value labels are remapped: each label's numeric value becomes min + max - old_value, so the label string stays tied to its original concept at its new position.

When called inside mutate(), metadata is recorded in @metadata@transformations[[col]].

Usage

make_rev(x, .label = NULL, .description = NULL)

Arguments

x

A numeric vector. typeof(x) must be "double" or "integer".

.label

character(1) or NULL. Variable label override. If NULL, inherits from attr(x, "label"); if that is also NULL, falls back to the column name.

.description

character(1) or NULL. Transformation description.

Value

A numeric vector (same typeof() as x) with reversed values.

See also

Other transformation: make_binary(), make_dicho(), make_factor(), make_flip()

Examples

x <- c(1, 2, 3, 4)
make_rev(x)
#> [1] 4 3 2 1
#> attr(,"label")
#> [1] "x"
#> attr(,"surveytidy_recode")
#> attr(,"surveytidy_recode")$fn
#> [1] "make_rev"
#> 
#> attr(,"surveytidy_recode")$var
#> [1] "x"
#> 
#> attr(,"surveytidy_recode")$description
#> NULL
#>