Covariate.varFunc {nlme} | R Documentation

## Assign varFunc Covariate

### Description

The covariate(s) used in the calculation of the weights of the variance function represented by `object` is (are) replaced by `value`. If `object` has been initialized, `value` must have the same dimensions as `getCovariate(object)`.

### Usage

    ## S3 method for class 'varFunc':
    covariate(object) <- value

### Arguments

`object` | an object inheriting from class `varFunc`, representing a variance function structure.
`value` | a value to be assigned to the covariate associated with `object`.

### Value

a `varFunc` object similar to `object`, but with its `covariate` attribute replaced by `value`.

### Author(s)

Jose Pinheiro Jose.Pinheiro@pharma.novartis.com and Douglas Bates bates@stat.wisc.edu

### See Also

`getCovariate.varFunc`

### Examples

    data(Orthodont)
    vf1 <- varPower(1.1, form = ~age)
    covariate(vf1) <- Orthodont[["age"]]

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