refactor | R Documentation |
Remove/reorder levels
refactor(x, levs = levels(x), repl = NA)
x |
Character or Factor |
levs |
Set of levels to use |
repl |
String (or NA) used to replace missing levels |
Keep only a specific set of levels in a factor. By removing levels the base for comparison in, e.g., regression analysis, becomes the first level. To relabel the base use, for example, repl = 'other'
refactor(diamonds$cut, c("Premium", "Ideal")) %>% head()
refactor(diamonds$cut, c("Premium", "Ideal"), "Other") %>% head()
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