Figure 13

Heatmap of the observed amount of interactions normalized by source (left) and target (right) occurring between different classes of users and, in brackets, the difference with the expected value obtained through the null model, for the FR-22 dataset. Colors indicate Z-scores, and we only color cells with Z-score significant at \(\alpha =0.05\). Cells are annotated with the normalized volume of interactions, and brackets report the difference w.r.t the value observed in the null model