mergeSmallFactorLevels: Merges small levels of factors into new level.

In mlr: Machine Learning in R

Merges small levels of factors into new level.

Description

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

Usage

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

Arguments

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”

Value

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

See Also

Other eda_and_preprocess: capLargeValues(), createDummyFeatures(), dropFeatures(), normalizeFeatures(), removeConstantFeatures(), summarizeColumns(), summarizeLevels()

mlr documentation built on June 22, 2024, 10:51 a.m.