varFunc Variance Function Structure
Description
If object is a one-sided formula, it is used as the argument to varFixed and the resulting object is returned. Else, if object inherits from class varFunc, it is returned unchanged.
Usage
varFunc(object)
Arguments
object | either an one-sided formula specifying a variance covariate, or an object inheriting from class |
Value
an object from class varFunc, representing a variance function structure.
Author(s)
José Pinheiro and Douglas Bates [email protected]
See Also
summary.varFunc, varFixed, varWeights.varFunc, coef.varFunc
Examples
vf1 <- varFunc(~age)
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Licensed under the GNU General Public License.