Spatial Pattern of Urban System Based on Gravity Model and Whole Network Analysis in Eight Urban Agglomerations of China

Table 3

Basic structural properties.

	Number of nodes	Number of edges	Average degree (weighted)	Density	Average clustering coefficient (ACC)	Average path length (APL)
BTH	13	40	1.642	0.513	0.736	1.577
PRD	14	50	3.368	0.549	0.672	1.527
YRD	25	127	2.475	0.423	0.672	1.803
MY	31	187	0.857	0.402	0.695	1.766
CY	16	43	0.746	0.358	0.624	1.775
ZY	14	37	0.765	0.407	0.517	1.846
HC	10	17	0.184	0.378	0.573	1.756
GZ	11	16	0.916	0.291	0.355	2.091

PRD, Pearl River Delta; YRD, Yangtze River Delta; MY, Mid-Yangtze; CY, Cheng-Yu; ZY, Zhongyuan; HC, Ha-Chang; GZ, Guanzhong.