formula.corStruct: Extract corStruct Object Formula
Description
This method function extracts the formula associated with a
corStruct object, in which the covariate and the grouping
factor, if any is present, are defined.
Usage
## S3 method for class 'corStruct':
formula(x, \dots)
Arguments
x
an object inheriting from class corStruct
representing a correlation structure.
...
some methods for this generic require additional
arguments. None are used in this method.
Value
an object of class formula specifying the covariate and the
grouping factor, if any is present, associated with x.