update_beta_negative_binomial

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function update_beta_negative_binomial(x:Integer, k:Integer, α:Real, β:Real) -> (Real, Real)

Update the parameters of a Beta distribution with a Negative Binomial likelihood.

• x: The variate.
• k: Number of successes.
• α: Prior first shape.
• β: Prior second shape.

Returns: the posterior hyperparameters α' and β'.