doBy (version 4.5-6)

createFunBy: A template function for creating groupwise functions

Description

A template function for creating groupwise functions

Usage

createFunBy(formula, data, FUN, class = NULL, ...)

Arguments

formula

A formula containing a vertical bar (which is used for defining groups)

data

A data frame

FUN

The function to be applied

class

The class to give the result of the returned value of the created function.

...

Further arguments passed on to FUN

Value

• A function

See Also

parseGroupFormula

Examples

## Example: Create a function for creating groupwise t-tests

mydata <- data.frame(y=rnorm(32), x=rnorm(32),
g1=factor(rep(c(1,2),each=16)), g2=factor(rep(c(1,2), each=8)),
g3=factor(rep(c(1,2),each=4))) 


t.testBy <- function(formula, data, ...){
  createFunBy(formula, data, FUN=t.test, class="t.testBy", ...)
}

t.testBy(y~g1|g2+g3, data=mydata)