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Table 2 Urban population and centrality measures, 1950–1990

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
  1. Source: own realization based on Lloyd’s Shipping Index and Geopolis data
  2. N.B. Measures marked by (a) are calculated excluding zero values