Coupling and Coordination of the Regional Economy, Tourism Industry, and Exhibition Industry of China’s Provinces

Table 3

Results of gray correlation analysis of measurement of primary indexes.

Subsystem	Primary indexes	Degree of association
Economic system	Economic quality	0.922
	Economic structure	0.923
	Economic sustainability	0.907
Tourism industry	Industry scale	0.920
	Industry efficiency	0.872
Exhibition industry	Industry scale	0.863
	Industry efficiency	0.863