Compare proportions between 2 groups

Description

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

Usage

1

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

Note

This funciton has been deprecated. Use diffprop instead.

Examples

 1
 2
 3
 4
 5
 6
 7
 8
 9
10
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")
}

Want to suggest features or report bugs for rdrr.io? Use the GitHub issue tracker.