Return cumulants


DESCRIPTION:
       Produces an object of class "cumulants"  which  is  needed
       for the psglm function.

USAGE:
       cumulants(family = gaussian,...)

REQUIRED ARGUMENTS:
family:   a family object

VALUE:
       An object of class "cumulants".

DETAILS:
       A list of eight components is returned. Text  descriptions
       of  the  first four cumulants, then the cumulant functions
       themselves. Mean value  parameterizations  are  used  with
       dispersion parameters assumed to be one.

SEE ALSO:
       familytoo, psglm.

EXAMPLES:
       cumulants()   # Gaussian cumulants
       cumulants(binomial)