Synergetic Development Measure of Airport Groups Composite System and Its Influencing Factors Analysis: Some Evidence from China

Table 5

Spatial econometric model test results.

Test	Nested weight matrix
	Statistical values		value
	LM test
	Spatial error (SEM)
Lagrange multiplier	4.959		0.026
Robust Lagrange multiplier	1.772		0.018
	Spatial lag (SLM) or (SAR)
Lagrange multiplier	5.691		0.017
Robust Lagrange multiplier	2.505		0.011
	Hausman test
Ho: Difference in coefficients not systematic	16.92		0.018
	LR test
LR test (H0: SAR nested in SDM)	26.96		0.003
LR test (H0: SEM nested in SDM)	59.67		≤0.001
	Wald test
Wald test for SAR	23.58		≤0.001
Wald test for SEM	34.27		≤0.001
	SDM regression
	Within	Between		Overall
SDM with time fixed-effects	0.9176	0.9031		0.8987
SDM with spatial fixed-effects	0.9569	0.7017		0.9204
SDM with spatial and time fixed-effects	0.9481	0.7535		0.9122

Note. 10% significance; 5% significance; 1% significance.