Use parameter output in the first model as an input in the next stan model

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Use posterior predictive distribution in another model

Hello, I have individual-level predictions produced by a non-parametric Bayesian model. Specifically I have, for each observation, a posterior distribution of the individual Relative Risks associated with a simulated change in a predictor (relative individual treatment effect, rITE). My goal is to find subgroups in the rITE (I use a tree on the median posterior values), and then to evaluate the posterior distribution of the rITE in each subgroup. My problem is that these groups can be small and…