Table 2.

Correlation analysis between centrality indicators.

Panel A: Correlation analysis of the four centrality indicators
	Degree	Closeness	Betweenness	Eigenvector
Degree	1.000
Closeness	0.257***	1.000
Betweenness	0.710***	0.367***	1.000
Eigenvector	0.092***	0.064***	0.080***	1.000
Panel B: Principal component analysis
	Comp1	Comp2	Comp3	Comp4
Degree	0.6167	−0.0857	−0.4003	0.6723
Closeness	0.4289	−0.0433	0.8925	0.1325
Betweenness	0.6442	−0.1104	−0.2068	−0.7281
Eigenvector	0.1440	0.9892	−0.0187	−0.0172
Eigenvalue	1.942	0.980	0.798	0.279
Proportion (%)	0.486	0.245	0.200	0.069
Cumulative (%)	0.486	0.731	0.931	1.000