Hierarchical Characteristics and Proximity Mechanism of Intercity Innovation Networks: A Case of 290 Cities in China

Table 3

Descriptive statistical and correlation coefficient matrix of variables (N = 2,112).

Variables	Expected value	Variance	Max	Min	VIF
	20.32	10739.98	3109.0	1.00		1.00
	3.57	0.88	7.00	1.85	2.020	0.016	1.00
	0.18	0.15	1.00	0.00	2.000	−0.024	0.707^∗∗∗	1.00
	0.81	0.02	1.00	0.25	1.035	−0.020	0.181^∗∗∗	0.153^∗∗∗	1.00

Notes..