Function r_stats::neg_binomial_pdf

pub fn neg_binomial_pdf(x: f64, size: f64, prob: f64, give_log: bool) -> f64

Evaluate the probability density function of the negative binomial distribution. If there is prob probability of successin a Bernoulli trial, and we perform trials until we see size successes, then this function returns the probability of seeing x failures in those trials.

If give_log is true, the natural logarithm of the value will be returned, with potentially higher numerical accuracy than calling .ln() on the result.