Figure 3

Discipline prevalence dendrogram. Clustering of the disciplines according to their time prevalence profile \(\tilde{f}_{I}(t)\). The lines in the plots on the right describe the average prevalence profile for the cluster \(\langle\tilde {f}_{C}(t)\rangle=\sum_{I\in C}\tilde{f}_{I}(t)/(\sum_{I\in C} 1)\). The shadowed area is included between the minimum value and the maximum value of the prevalence profile on the cluster \((\min_{I\in C}\tilde {f}_{I}(t),\max_{I\in C}\tilde{f}_{I}(t))\).