Reorder Two Columns Levels Simultaneously
Usage
co_relevels(df, primary, secondary, levels_primary)
Arguments
- df
(data.frame) with two column whose factors should be reordered.
- primary
(string) the name of the column on which the levels reordering should be based.
- secondary
(string) the name of the column whose levels should be reordered following the levels of the
primary column.
- levels_primary
(character) the levels in the desired order. Existing levels that are not included will be
placed afterward in their current order.
Value
a data.frame with the secondary column converted to factor with reordered levels.
Details
The function expect a 1:1 matching between the elements of the two selected column.
Examples
df <- data.frame(
SUBJID = 1:3,
PARAMCD = factor(c("A", "B", "C")),
PARAM = factor(paste("letter", LETTERS[1:3]))
)
co_relevels(df, "PARAMCD", "PARAM", levels_primary = c("C", "A", "B"))
#> SUBJID PARAMCD PARAM
#> 1 1 A letter A
#> 2 2 B letter B
#> 3 3 C letter C