# extend.formula: Extends a formula with predictors

## Description

Extends a formula with predictors

## Usage

extend.formula(formula = ~0, predictors = NULL, auxiliary = TRUE,
include.intercept = FALSE, ...)

## Arguments

formula

A formula. If it is
not a formula, the formula is internally reset to `~0`

.

predictors

A character vector of variable names.

auxiliary

A logical that indicates whether the variables
listed in `predictors`

should be added to the formula as main
effects. The default is `TRUE`

.

include.intercept

A logical that indicated whether the intercept
should be included in the result.