Fig. 2: Model 1’s PSIS-LOO diagnosis with priors as norm (1,0.5).

The model’s goodness-of-fit can be classified into four levels: (1) ‘good’ if its k-values are all below 0.5, (2) ‘OK’ if its k-values are more than 0.5 and below 0.7, (3) ‘bad’ if its k-values are more than 0.7 and below 1, and (4) ‘very bad’ if its k-values are more than 1.