R: Extract components from a formula with "conditioning bar"

parseGroupFormula {doBy} | R Documentation

## Extract components from a formula with "conditioning bar"

### Description

Extract components from a formula with the form `y~x1+...xn|g1+...gm`

### Usage

    parseGroupFormula(form)

### Arguments

`form` | A formula of the form `y~x1+...xn|g1+...gm`

### Value

If the formula is `y~x1+x2|g1+g2` the result is

`model` | `y~x1+x2`
`groups` | `g1+g2`
`groupFormula` | `~g1+g2`

### Note

This function is a recent addition and has not been thoroughly tested. Please report bugs.

### Author(s)

Søren Højsgaard, sorenh@math.aau.dk

### Examples

    gf<-parseGroupFormula(y~x1+x2|g1+g2)

[Package doBy version 4.5-15 Index]