The links to some stan models are dead: - [varying intercept and slope model](https://github.com/stan-dev/example-models/blob/master/ARM/Ch.17/17.1_radon_vary_inter_slope.stan) - [varying intercept and slope model with correlation between slopes and intercepts](https://github.com/stan-dev/example-models/blob/master/ARM/Ch.17/17.1_radon_correlation.stan) - [varying intercept and slope model with group level predictors](https://github.com/stan-dev/example-models/blob/master/ARM/Ch.17/17.2_radon_vary_inter_slope.stan) - [varying intercept and slope model with correlation between slopes and intercepts and group level predictors](https://github.com/stan-dev/example-models/blob/master/ARM/Ch.17/17.2_radon_correlation.stan)
