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 19, 2024, 11:14pm 8

@TeemuSailynoja I have noticed people, including yourself, using the term ‘observation model’. What does it mean? And why do you say the negative binomial doesn’t make sense?

Solving prior-data conflicts in zero-inflated beta binomial model

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

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