Tools for Working with Categorical Variables (Factors)
c(
    person("Hadley", "Wickham", , "hadley@rstudio.com", role = c("aut", "cre")),
    person("RStudio", role = c("cph", "fnd"))
  )
Helpers for reordering factor levels (including moving
    specified levels to front, ordering by first appearance, reversing, and
    randomly shuffling), and tools for modifying factor levels (including
    collapsing rare levels into other, 'anonymising', and manually 'recoding').
Hadley Wickham [aut, cre],
  RStudio [cph, fnd]