formula.groupedData {nlme} | R Documentation |
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.
formula(object)
object |
an object inheriting from class groupedData . |
a two-sided formula with a conditioning expression, representing the
display formula for object
.
Jose Pinheiro and Douglas Bates
data(Orthodont) formula(Orthodont)