Table 2 Characteristics of the hierarchical structure of the inter-city flow network of highly educated talents between the Yangtze River Delta and the whole nation.

From: Analysis of spatial characteristics and influencing factors of the flow network of highly educated talents from national and local perspective

Level

No. nodes

Average degree

Average weighted degree

Average closeness centrality

Average betweenness centrality

Density

Core

1

190.00

714.00

0.3650

10,374.13

0.8589

Semi-periphery

31

14.52

19.71

0.2887

485.59

0.4569

Periphery

212

3.29

5.55

0.2842

74.81

0.0001

Whole network

244

5.48

11.12

0.2850

169.21

0.0099

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