R: Merges small levels of factors into new level.

mergeSmallFactorLevels {mlr}

R Documentation

Merges small levels of factors into new level.

Merges factor levels that occur only infrequently into combined levels with a higher frequency.

mergeSmallFactorLevels(task, cols = NULL, min.perc = 0.01,
  new.level = ".merged")

`task`	(Task) The task.
`cols`	(character) Which columns to convert. Default is all factor and character columns.
`min.perc`	(`numeric(1)`) The smallest levels of a factor are merged until their combined proportion w.r.t. the length of the factor exceeds `min.perc`. Must be between 0 and 1. Default is 0.01.
`new.level`	(`character(1)`) New name of merged level. Default is “.merged”

Task, where merged levels are combined into a new level of name new.level.