Beta and dirichlet regression for continuous proportion data

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I will let one of the more bambi-savvy folks answer you actual question. However, I will note that there are several examples of this type of model built in pymc (rather than bambi). This thread, and Alex’s chiming in with a pointer to this notebook, as well as the discussion on this old issue. If you’re looking to get your hands dirty a bit, those may help you get going (and of course you can ask here if they aren’t exactly what you need).

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