logpdf_lazy_negative_binomial
function logpdf_lazy_negative_binomial(x:Expression<Integer>, k:Expression<Integer>, ρ:Expression<Real>) -> Expression<Real>
Observe a negative binomial variate.
- x: The variate (number of failures).
- k: Number of successes before the experiment is stopped.
- ρ: Probability of success.
Returns: the log probability mass.