Optional:
- Bayesian Data Analysis (Third Edition) by Andrew Gelman, John Carlin, Hal Stern, David Dunson, Aki Vehtari, and Donald Rubin.:
- Section 5.4: Estimating exchangeable parameters for a normal model
- Section 5.5: Example: parallel experiments in eight schools
- Section 5.7: Weakly informative priors for hierarchical variance parameters