Provides parameter estimates, standard errors and univariate Wald test
for the Poisson-Tweedie and the negative binomial generalized linear models
(fitted through ptglm and nbglm respectively)
# S3 method for ptglm
summary(object, ...)an object of class ptglm
(obtained from ptglm or nbglm).
Further arguments passed to or from other methods.
A list with the following elements: logl, coefficients,
D, a