This functions reimplement some functionality from package bbmle
to work better with objects from the classes fitsad-class
and fitrad-class.
signature("mle2"): Akaike information criterion.
signature("mle2"): Akaike information
criterion corrected for small samples.
signature(object = "fitsad"): Number of observations.
signature(object = "fitrad"): Number of observations.
mle2-class for all methods available from which
fitsad-class inherits; fitsad for details on
fitting SADs models.