From: The changing influence of city-systems on global shipping networks: an empirical analysis
Measures | 1951 | 1960 | 1970 | 1980 | 1990 | Interpretation | |
---|---|---|---|---|---|---|---|
Linear correlation (Pearson) | Clustering coefficienta | −0.231 | −0.251 | −0.255 | −0.202 | −0.210 | Neighborhood centralization |
Degree centrality | 0.462 | 0.521 | 0.469 | 0.465 | 0.423 | Local (neighborhood) connectivity by the number of links | |
Betweenness centralitya | 0.507 | 0.494 | 0.449 | 0.452 | 0.344 | Global maritime accessibility or number of occurrences on shortest routes | |
Rich-club coefficient | 5.597 | 5.959 | 5.166 | 4.974 | 4.843 | Network density among larger cities versus in the entire network |