Deviance of a Fitted Model - Generic Function

DESCRIPTION:

Returns the deviance or weighted residual sum of squares of the model.
This function is an S Version 3 generic (see Methods); method functions can be written to handle specific S Version 3 classes of data. Classes that already have methods for this function include bdGlm, bdLm, gam, glm, lm, and tree.

USAGE:

deviance(object, ...) 

REQUIRED ARGUMENTS:

object
a fitted model object.

OPTIONAL ARGUMENTS:

...
methods may have additional arguments.

VALUE:

the deviance of the fitted model is returned.

DETAILS:

For bdGlm, gam, glm, and tree models, the "deviance" is a component of object, in which case deviance is a simple extractor function. For other models, the gaussian family is assumed and the weighted residual sum of squares is returned.