R: Extract Data Frame Covariate

getCovariate.data.frame {nlme} | R Documentation

## Extract Data Frame Covariate

### Description

The right hand side of `form`, stripped of any conditioning expression (i.e. an expression following a `|` operator), is evaluated in `object`.

### Usage

    ## S3 method for class 'data.frame'
    getCovariate(object, form, data)

### Arguments

`object` | an object inheriting from class `data.frame`.
`form` | an optional formula specifying the covariate to be evaluated in `object`. Defaults to `formula(object)`.
`data` | some methods for this generic require a separate data frame. Not used in this method.

### Value

the value of the right hand side of `form`, stripped of any conditional expression, evaluated in `object`.

### Author(s)

José Pinheiro and Douglas Bates bates@stat.wisc.edu

### See Also

`getCovariateFormula`

### Examples

    getCovariate(Orthodont)

[Package nlme version 3.1-118 Index]