Research on the Impact of Expressway on the County Economy Based on a Spatial DID Model: The Case of Three Provinces of China

Table 9

The LR test results.

Index	Guangdong	value	Hubei	value	Qinghai	value
SDM/SAR	45.52	0	68.78	0	33.23	0
SDM/SEM	158.69	0	178.46	0	110.57	0