Challenge questions

Not for grades!

These are not essential for learning the material and can be skipped without affecting your grade. If you successfully solve one set of problem, a week of participation activity will be waived (it does not have to be the same week you submit the challenge question). Submit your answer at any time. I will not post solutions for the challenge questions.

Fit a hierarchical model in Stan. E.g., modify the tutorial on tidybayes to make the model hierarchical, following the same model as in exercise 6. (You may also use a different example if you find a data set and describe the model.)