Fig. 2

Results of bootstrap analysis: number of arcs in 10,000 bootstrapped networks. The network resulting from the exact search contained 22 arcs. Out of the 10,000 bootstrapped networks more than a third contained more than 22 arcs. This indicates that substantial randomness was introduced and let to overfitting, i.e. spurious arcs and confirms the robustnest of the network with 22 arcs