Does Airport Preferential Policy Aggravate the Competition of Aviation Hubs in Central and Western China? Based on the Investigation of 78 Airports

Table 3

RMSPE comparison chart.

Objects	The predictive quality of the application of SCM before the implementation of the policy
	RMSPE	lncm (2001)	lncm (2006)	gov	lnta	lnpop	pd	esis	sec	lntea	proad
Cargo flow at Xinzheng Airport	0.0931	9.85	10.84	1.13	1.49	6.62	0.10	0.07	53.45	10.05	3.40
Synthetic cargo flow at Xinzheng Airport		9.86	10.73	1.54	1.11	6.72	0.07	0.06	47.75	9.82	3.84
Passenger flow of Xinzheng Airport	0.0806	14.24	15.17	1.13	1.49	6.62	0.10	0.07	53.45	10.05	3.40
Synthetic passenger flow of Xinzheng Airport		14.27	15.26	1.39	1.50	6.57	0.05	0.07	46.35	9.98	4.17