I am applying the workflow laid out in Aki Vehtari’s case-study here. https://users.aalto.fi/~ave/casestudies/Nabiximols/nabiximols.html The form of the outcome variable is the same as in the case-study - bounded count indicating days of substance use in the previous 28 days - but the sample is di…

Yes, in short, a zero-inflated version of the beta binomial distribution would estimate an additional probability for the zero counts, thus giving some additional freedom for the other parameters to explain the tail of the distribution. I believe you could try it by first just changing the family f…

Interpreting posterior predictive checks on a longitudinal beta-binomial model of amphetamine use

Modeling

llewmills September 20, 2024, 11:50am 10

Thank you @avehtari so what then is the alternative to an observation model? What other types of model are there?

Is it possible to compare a gaussian model to an ordinal model using loo-cv

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Interpreting posterior predictive checks on a longitudinal beta-binomial model of amphetamine use

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