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| as_factor | Convert input to a factor |
| as_factor.character | Convert input to a factor |
| as_factor.factor | Convert input to a factor |
| as_factor.logical | Convert input to a factor |
| as_factor.numeric | Convert input to a factor |
| fct_anon | Anonymise factor levels |
| fct_c | Concatenate factors, combining levels |
| fct_collapse | Collapse factor levels into manually defined groups |
| fct_count | Count entries in a factor |
| fct_cross | Combine levels from two or more factors to create a new factor |
| fct_drop | Drop unused levels |
| fct_expand | Add additional levels to a factor |
| fct_explicit_na | Make missing values explicit |
| fct_infreq | Reorder factor levels by first appearance, frequency, or numeric order |
| fct_inorder | Reorder factor levels by first appearance, frequency, or numeric order |
| fct_inseq | Reorder factor levels by first appearance, frequency, or numeric order |
| fct_lump | Lump together factor levels into "other" |
| fct_lump_lowfreq | Lump together factor levels into "other" |
| fct_lump_min | Lump together factor levels into "other" |
| fct_lump_n | Lump together factor levels into "other" |
| fct_lump_prop | Lump together factor levels into "other" |
| fct_match | Test for presence of levels in a factor |
| fct_other | Replace levels with "other" |
| fct_recode | Change factor levels by hand |
| fct_relabel | Automatically relabel factor levels, collapse as necessary |
| fct_relevel | Reorder factor levels by hand |
| fct_reorder | Reorder factor levels by sorting along another variable |
| fct_reorder2 | Reorder factor levels by sorting along another variable |
| fct_rev | Reverse order of factor levels |
| fct_shift | Shift factor levels to left or right, wrapping around at end |
| fct_shuffle | Randomly permute factor levels |
| fct_unify | Unify the levels in a list of factors |
| fct_unique | Unique values of a factor |
| first2 | Reorder factor levels by sorting along another variable |
| gss_cat | A sample of categorical variables from the General Social survey |
| last2 | Reorder factor levels by sorting along another variable |
| lvls | Low-level functions for manipulating levels |
| lvls_expand | Low-level functions for manipulating levels |
| lvls_reorder | Low-level functions for manipulating levels |
| lvls_revalue | Low-level functions for manipulating levels |
| lvls_union | Find all levels in a list of factors |