It's a hierarchical model
- Everything I need to know about Bayesian statistics, I learned in eight schools
- https://github.com/stan-dev/rstan/wiki/RStan-Getting-Started
- https://pluto.coe.fsu.edu/svn/common/rgroup-shiny/Bayesian/Schools8Stan.nb.html
- https://astrostatistics.psu.edu/su14/lectures/StanWorkshop.pdf - Lab 3: Hierarchical model