dewens                  Probability mass function for the Ewens
                        distribution
dewens_k                Probability mass function for the number of
                        classes from a Ewens distribution
ewens_k_exact           Calculate expected number of classes in a
                        sample of size n given theta
ewens_mle               Maximum likelihood estimate of theta given
                        sample vector with class memberships
gcrp                    Draw from a generalized Chinese Restaurant
                        Process
rewens                  Draw from the Ewens distribution
rgem                    Draw from the Griffiths-Engen-McCloskey
                        distribution
