model.frame
method for
arbor
objects.
model.frame.arbor(formula, ...)
model.frame
suitable for fitting an
arbor
-based
model. Called by
arbor
and other functions for manipulating
arbor
objects.
This function is a method for the generic function
model.frame
for
class
arbor
. It can be invoked by calling
model.frame
for an object
of the appropriate class, or directly by calling
model.frame.arbor
regardless of the class of the object.