The function terms is a generic function
which can be used to extract terms objects
from various kinds of R data objects.
terms(x, …)object used to select a method to dispatch.
further arguments passed to or from other methods.
An object of class c("terms", "formula") which contains the
terms representation of a symbolic model. See
terms.object for its structure.
There are methods for classes "aovlist", and "terms"
"formula" (see terms.formula):
the default method just extracts the terms component of the
object, or failing that a "terms" attribute (as used by
model.frame).
There are print and labels methods for
class "terms": the latter prints the term labels (see
terms.object).
Chambers, J. M. and Hastie, T. J. (1992) Statistical models. Chapter 2 of Statistical Models in S eds J. M. Chambers and T. J. Hastie, Wadsworth & Brooks/Cole.