Create a Model Frame for fitting an Arbor Object

DESCRIPTION:

model.frame method for arbor objects.

USAGE:

model.frame.arbor(formula, ...) 

REQUIRED ARGUMENTS:

formula
the formula or other object defining what terms should be included in the model frame.

VALUE:

An object of class model.frame suitable for fitting an arbor-based model. Called by arbor and other functions for manipulating arbor objects.

DETAILS:

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.

SEE ALSO: