fmclass: Register Comparable Functions
In fit.models: Compare Fitted Models

The fit.models package maintains a list of comparable models. These functions provide an api to modify this list.

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fmclass.register(fmclass, classes, validation.function = NULL)

fmclass.add.class(fmclass, class, warn = TRUE)

`fmclass`	a character string naming the fit.models class to be added.
`classes`	a character vector naming one or more classes that can be compared by the methods defined for the fit.models class in `fmclass`.
`validation.function`	a function returning `TRUE` when the models are comparable.
`class`	a character string specifying a class compatible with the methods of `fmclass`.
`warn`	a logical value. If TRUE, a warning is printed if `class` is already registered.