Thanks for the suggestion. I think I have to lookup stanvar and stan coding in order to implement this hyper-prior. Otherwise, I have to implement in stan code alone instead of using brms package. I think per this post Initialisation issues when using student-t for hierarchical priors - #5 by paul.buerkner. It seems that stanvar is experimental. I would be better off by hard coding in stan instead.
zasdzcc
3
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