fctdrop
fctdrop is a function provided by the forcats package, part of the tidyverse collection of R packages. It is designed to modify factor objects by removing levels that are not present in the data or that the user explicitly requests. The function helps keep factor levels tidy, improving downstream analysis and visualizations that depend on factor ordering.
The typical usage of fctdrop is to pass a factor variable as the first argument. The function
Parameters of fctdrop include the factor to modify, an optional character vector of levels to drop, and
A basic example shows a data frame with an factor column containing levels A, B, C and
fctdrop is often paired with related functions such as fct_drop_all, fct_cap, or fct_revalue to manipulate factor