FIG. 4.

Fraction of strong ties correctly identified by our algorithm for both heterogeneous (“he”) and homogeneous (“ho”) activity distributions, and for homogeneous degree in the backbone. The backbone is a 4-regular network with $n=200$ nodes. The other parameters are $\gamma =0.95, \lambda =0.9$, and $\mu =0.1$. Three cases for the activity distribution are examined: all the nodes have the same activity $a_i=0.2$ (ho-low, dashed), $a_i=0.8$ (ho-high, dotted), and half the nodes have $a_i=0.2$ and half have $a_i=0.8$ (he, colored). For the last case of heterogeneous activities, the TPR curve is plotted with respect to links between nodes with low activity (blue), links between nodes of different activity (orange), and links between nodes with high activity (green). Only one FDR curve is plotted for all the cases, since they are practically indistinguishable (he, red).