Figure 9

Rank correlations for port (a-b) and edge (c-d) importance measures. Ranking ports by number of routes they participates in has the strongest correlation with the top 100 ports by container throughput, and port rankings based on route betweenness correlate more strongly with ranking by container throughput than either topological betweenness measure. Ranking by route node betweenness correlates strongly with the top 100 ports by total TEU capacity. Correlation of edge rankings with route edge betweenness and total TEU capacity is strongly positive. Aggregating edge betweenness to the country level, betweenness in the directed and undirected co-route graphs correlates more strongly with bilateral trade than route edge betweenness or path graph betweenness. Dashed lines in the right plots indicate \(p=0.01, 0.001\), and 0.0001