dnbconv                 Calculates the PMF for the convolution of
                        arbitrary negative binomial random variables.
nb_sum_exact            Implements Furman's exact PMF for the
                        evaluation of the sum of arbitrary NB random
                        variables. Called by other functions. Not
                        intended to be run alone.
nb_sum_moments          Implements the method of moments approximation
                        for the sum of arbitrary NB random variables.
                        Called by other functions. Not intended to be
                        run alone.
nb_sum_saddlepoint      Implements the saddlepoint approximation for
                        the sum of arbitrary NB random variables.
                        Called by other functions. Not intended to be
                        run alone.
nbconv_params           Calculates distribution parameters for the
                        convolution of arbitrary negative binomial
                        random variables.
pnbconv                 Calculates the CDF for the convolution of
                        arbitrary negative binomial random variables.
qnbconv                 Calculates the quantile function for the
                        convolution of arbitrary negative binomial
                        random variables.
rnbconv                 Generates random samples from the convolution
                        of arbitrary negative binomial random
                        variables.
