This method function extracts the display formula associated with a
groupedData object. This is a two-sided formula of the form
resp ~ cov | group, where resp is the response,
cov is the primary covariate, and group is the grouping
structure.
Usage
## S3 method for class 'groupedData':
formula(x, \dots)
Arguments
x
an object inheriting from class groupedData.
...
some methods for this generic require additional
arguments. None are used in this method.
Value
a two-sided formula with a conditioning expression, representing the
display formula for x.