logpdf_lazy_negative_binomial

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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.