I’m defining my negative binomial like this currently: dispersion = pm.HalfNormal(‘dispersion’, 1) sigma = mean_rate * (1 + mean_rate / dispersion) counts = pm.NegativeBinomial(“counts”, mu=rates, alpha=sigma, observed=event_count) So the dispersion is moderating the over-dispersion of the negat…

Prior for negative binomial dispersion moderator

FruitfulFig September 10, 2022, 12:01pm 5

Thanks for the replies - much appreciated.

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