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`

### Author(s)

Søren Højsgaard, sorenh@math.aau.dk

### Examples

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

[Package doBy version 4.6.6 Index]