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

Table 4

Results of gray correlation analysis of measurement of secondary indexes.

Subsystem	Primary indexes	Secondary indexes	Degree of association
Economic system	Economic quality	GDP per capita	0.922
		Per capita disposable income	0.923
	Economic structure	The proportion of secondary industry	0.918
		The proportion of tertiary industry	0.927
	Economic sustainability	Fiscal revenue	0.910
		GDP growth rate	0.904
Tourism industry	Industry scale	Number of travel agencies	0.928
		Number of A-grade scenic spots	0.902
		Number of starred hotels	0.929
	Industry efficiency	Domestic tourist income	0.895
		International tourist income	0.849
Exhibition industry	Industry scale	Number of exhibitions	0.864
		Exhibition area	0.862
	Industry efficiency	Number of professional venues	0.862
		Area of professional venues	0.863