Sample from zero-inflated negative binomial distribution
Source:R/random.R
monty_random_zi_negative_binomial.RdSample from a zero-inflated negative binomial distribution. With probability
pi0 a 0 is drawn, otherwise it draws from the corresponding standard
negative binomial distribution (which may also result in a 0 being drawn).
As with the standard negative binomial distribution, there are two
parameterisations available, based on either the success probability or
mean of the negative binomial part of the distribution.
Usage
monty_random_zi_negative_binomial_prob(pi0, size, prob, state)
monty_random_n_zi_negative_binomial_prob(n_samples, pi0, size, prob, state)
monty_random_zi_negative_binomial_mu(pi0, size, mu, state)
monty_random_n_zi_negative_binomial_mu(n_samples, pi0, size, mu, state)Arguments
- pi0
The probability of excess zeros
- size
The target number of successful trials (zero or more)
- prob
The probability of success on each trial (between 0 and 1)
- state
The random number state, from monty_rng_create
- n_samples
The number of samples to take, per stream. When using the multiple-sample interface, all other parameters are held constant (per stream).
- mu
The mean (zero or more) of the negative binomial part of the distribution. Note the mean of the zero-inflated negative binomial distribution will actually be
(1 - pi0) * mu