terms: Model Terms

Description

The function terms is a generic function which can be used to extract terms objects from various kinds of R data objects.

Usage

terms(x, ...)

Arguments

object used to select a method to dispatch.

...

further arguments passed to or from other methods.

Value

An object of class c("terms", "formula") which contains the terms representation of a symbolic model. See terms.object for its structure.

Details

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).

References

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.