Fig. 4.

Eye Tracking Data; posterior distributions $\text{Pr}(K_{+}|\mathbf{y})$ of the number of clusters $K_{+}$; top: sparse finite mixtures with $K=10$, $e_0\sim \mathcal{G}(1,200)$ (left-hand side) and matched prior $e_0\sim \mathcal{G}(2,4K)$ (right-hand side); bottom: DPM with $\alpha \sim \mathcal{G}(2,4)$ (right-hand side) and matched prior $\alpha \sim \mathcal{G}(1,200/K)$ (left-hand side)