R: Extract Covariate from an Object

getCovariate {nlme} | R Documentation

## Extract Covariate from an Object

### Description

This function is generic; method functions can be written to handle specific classes of objects. Classes which already have methods for this function include `corStruct`, `corSpatial`, `data.frame`, and `varFunc`.

### Usage

    getCovariate(object, form, data)

### Arguments

`object` | any object with a `covariate` component
`form` | an optional one-sided formula specifying the covariate(s) to be extracted. Defaults to `formula(object)`.
`data` | a data frame in which to evaluate the variables defined in `form`.

### Value

will depend on the method function used; see the appropriate documentation.

### Author(s)

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

### References

Pinheiro, J.C., and Bates, D.M. (2000) "Mixed-Effects Models in S and S-PLUS", Springer, esp. p. 100.

### See Also

`getCovariate.corStruct`, `getCovariate.data.frame`, `getCovariate.varFunc`, `getCovariateFormula`

### Examples

    ## see the method function documentation

[Package nlme version 3.1-118 Index]