Collapse factor levels into manually defined groups
Combine levels from two or more factors to create a new factor
Reorder factor levels by first appearance, frequency, or numeric order
Lump uncommon factor together levels into "other"
Convert between 'NA' values and 'NA' levels
Relabel factor levels with a function, collapsing as necessary
Reorder factor levels by sorting along another variable
Shift factor levels to left or right, wrapping around at end
forcats: Tools for Working with Categorical Variables (Factors)
A sample of categorical variables from the General Social survey
Low-level functions for manipulating levels