1 #ifndef STAN_MATH_PRIM_SCAL_PROB_NEG_BINOMIAL_2_RNG_HPP
2 #define STAN_MATH_PRIM_SCAL_PROB_NEG_BINOMIAL_2_RNG_HPP
4 #include <boost/math/special_functions/digamma.hpp>
5 #include <boost/random/negative_binomial_distribution.hpp>
6 #include <boost/random/variate_generator.hpp>
31 using boost::variate_generator;
32 using boost::random::negative_binomial_distribution;
33 using boost::random::poisson_distribution;
34 using boost::gamma_distribution;
36 static const char*
function(
"stan::math::neg_binomial_2_rng");
41 double mu_div_phi = mu/phi;
45 "Location parameter divided by the precision parameter",
48 double rng_from_gamma =
49 variate_generator<RNG&, gamma_distribution<> >
50 (rng, gamma_distribution<>(phi, mu_div_phi))();
54 "Random number that came from gamma distribution",
57 "Random number that came from gamma distribution",
60 "Random number that came from gamma distribution",
63 return variate_generator<RNG&, poisson_distribution<> >
64 (rng, poisson_distribution<>(rng_from_gamma))();
bool check_less(const char *function, const char *name, const T_y &y, const T_high &high)
Return true if y is strictly less than high.
bool check_not_nan(const char *function, const char *name, const T_y &y)
Return true if y is not NaN.
int neg_binomial_2_rng(const double mu, const double phi, RNG &rng)
const double POISSON_MAX_RATE
Largest rate parameter allowed in Poisson RNG.
bool check_nonnegative(const char *function, const char *name, const T_y &y)
Return true if y is non-negative.
bool check_positive_finite(const char *function, const char *name, const T_y &y)
Return true if y is positive and finite.