Evolution Characteristics of Advanced Nonferrous Metal Industry Patent Cooperation Network in China from the Perspective of Multilayer Network

Table 5

Co-occurrence topological index of cooperative patent technology in the advanced nonferrous metal industry.

	Network size	Network connection	Average degree	Network diameter	Graph density	Mean clustering coefficient	Average path length
02–07 years	112	331	5.911	7	0.053	0.732	3.021
08–11 years	206	834	8.097	5	0.039	0.725	2.717
12–16 years	284	1630	11.479	4	0.041	0.668	2.505
17–20 years	325	2086	12.837	4	0.04	0.707	2.446