Random generation of values from a Generalized Waring distribution with parameters a, k and ro.
rgw(n, a, k, ro)number of random values to return.
vector of (non-negative) first parameters.
vector of (non-negative) second parameters.
vector of (non-negative) third parameters.
rgw is an auxiliar function which generates random samples from a Generalized Waring distribution to be used in the simulated envelope called by residuals.