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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