Top 3 R brm Projects

brms

1 1,125 9.2 R

brms R package for Bayesian generalized multivariate non-linear multilevel models using Stan

Project mention: [Q] Correlated multivariate Beta model | reddit.com/r/statistics | 2022-06-09

Maybe something like the Logistic Normal ? (e.g. see this issue from brms). If that fits what you are looking for, you can use brms to generate the Stan code for you (brms::make_stan_code()) and work from that.
mixed-models-with-R

1 111 4.6 R

Covers the basics of mixed models, mostly using @lme4

Project mention: Understanding fixed versus random effect | reddit.com/r/AskStatistics | 2022-08-30

[2]: https://github.com/m-clark/mixed-models-with-R/blob/master/data.zip
InfluxDB

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bayesian

0 39 8.3 R

Bindings for Bayesian TidyModels (by hsbadr)

NOTE: The open source projects on this list are ordered by number of github stars. The number of mentions indicates repo mentiontions in the last 12 Months or since we started tracking (Dec 2020). The latest post mention was on 2022-08-30.