mergeSmallFactorLevels: Merges small levels of factors into new level.

In riebetob/mlr: Machine Learning in R

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

riebetob/mlr documentation built on May 20, 2019, 5:58 p.m.