Returns the residual degrees-of-freedom extracted from a fitted model object.
- an object for which the degrees-of-freedom are desired.
- additional optional arguments.
This is a generic function which can be used to extract residual
degrees-of-freedom for fitted models. Consult the individual modeling
functions for details on how to use this function. The default method just extracts the
The value of the residual degrees-of-freedom extracted from the object