swap: Swap values among columns of a data frame

In mosaic: Project MOSAIC Statistics and Mathematics Teaching Utilities

Swap values among columns of a data frame

Description

Swap values among columns of a data frame

Usage

swap(data, which)

Arguments

data	a data frame
which	a formula or an integer or character vector specifying columns in data

Details

swap is not a particularly speedy function. It is intended primarily as an aid for teaching randomization for paired designs. Used this way, the number of randomizations should be kept modest (approximately 1000) unless you are very patient.

Examples

if (require(tidyr)) {
  Sleep2 <- sleep |> spread( key=group, val=extra )
  names(Sleep2) <- c("subject", "drug1", "drug2")
  swap(Sleep2, drug1 ~ drug2)
  mean( ~(drug1 - drug2), data=Sleep2)
  do(3) * mean( ~(drug1 - drug2), data=Sleep2 |> swap(drug1 ~ drug2) ) 
} 

mosaic documentation built on May 29, 2024, 5:27 a.m.