mosaic (version 1.1.0)

compareProportion: Compare proportions between 2 groups

Description

A function to facilitate 2 group permutation tests for a categorical outcome variable

Usage

compareProportion(formula, data = NULL, ...)

Arguments

formula

a formula

data

a data frame in which x is evaluated if x is a formula.

other arguments

Value

the difference in proportions between the second and first group

Examples

Run this code
# NOT RUN {
if (require(mosaicData)) {
  data(HELPrct)
  # calculate the observed difference
  mean(homeless=="housed" ~ sex, data=HELPrct)
  obs <- diffprop(homeless=="housed" ~ sex, data=HELPrct); obs
  # calculate the permutation distribution
  nulldist <- do(100) * diffprop(homeless=="housed" ~ shuffle(sex), data=HELPrct)
  histogram(~ diffprop, groups=(diffprop>= obs), nulldist, 
    xlab="difference in proportions")
}
# }

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