internalSubAsRest: Substitute values in a dataframe proportionally to all other...

In rrwen/nbc4va: Bayes Classifier for Verbal Autopsy Data

Substitute values in a dataframe proportionally to all other values

Description

Substitute a target value proportionally to the distribution of the rest of the values in a column, given the following conditions:

• If a column contains only the target value, the column is removed

• If there are not enough target values to be distributed, then each target value will be randomly sampled from the rest of the column values with replacement

Usage

internalSubAsRest(
  dataset,
  x,
  cols = 1:ncol(dataset),
  ignore = c(NA, NaN),
  removal = FALSE
)

Arguments

dataset	A dataframe with value(s) of x in it.
x	A target value in dataframe to replace with the rest of values per column.
cols	A numeric vector of columns to consider for substitution.
ignore	A vector of the rest of the values to ignore for substitution.
removal	Set to TRUE to remove column(s) that consist only of x values.

Details

Pseudocode of algorithm:

  SET dataset = table of values with columns and rows
  SET x = target value for substitution

  IF x in dataset:
    FOR EACH column y in a dataset:
      SET xv = all x values in y
      SET rest = all values not equal to x in y
      IF xv == values in y:
        REMOVE y in dataset
      IF number of unique values of rest == 1:
        MODIFY xv = rest
      IF number of xv values < number of unique values of rest:
        SET xn = number of xv values
        MODIFY xv = random sample of rest with size xn
      ELSE:
        SET xn = number of xv values
        SET p = proportions of rest
        SET xnp = xn * p
        IF xnp has decimals:
          MODIFY xnp = round xnp such that sum(xnp) == xn via largest remainder method
        MODIFY xv = rest values with distribution of xnp
  RETURN dataset

Value

out A dataframe or list depending on removal:

• if (removal is FALSE) return the dataset with values of x substituted by the rest of the values per column

• if (removal is TRUE) return a list with the following:

  • $removed (vectorof numeric): the removed column indices if the column(s) consists only of x values

  • $dataset (dataframe): the dataset with values of x substituted by the rest of the values per column

See Also

Other data functions: internalRoundFixedSum()

Examples

library(nbc4va)
data(nbc4vaDataRaw)
unclean <- nbc4vaDataRaw
clean <- nbc4va::internalSubAsRest(unclean, 99)

rrwen/nbc4va documentation built on May 11, 2022, 9:45 p.m.