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

Table 2

Descriptive statistics of the main variables.

Province	Variable Name	Observed	Mean	Variance	Min	Max
Guangdong	GDP (10,000 yuan)	1092	2,232,373	3,506,064	48,577	30,589,219
	Population (10,000 people)	1092	77	47	7	247
	Investment in fixed assets (10,000 yuan)	1092	846,435	1,236,250	4151	10,782,942
	Financial revenue (10,000 yuan)	1092	117,068	233,925	2013	2,248,715
	Financial expenditure (10,000 yuan)	1092	233,964	275,213	10190	2,743,406
Hubei	GDP (10,000 yuan)	938	1,278,927	1,253,906	43,543	7,171,791
	Population (10,000 people)	938	66	33	8	165
	Investment in fixed assets (10,000 yuan)	938	997,944	1,230,851	6626	7,993,968
	Financial revenue (10,000 yuan)	938	65,093	85,384	832	980,543
	Financial expenditure (10,000 yuan)	938	200,473	165,795	7488	831,728
Qinghai	GDP (10,000 yuan)	546	247,665	419,003	3108	3,272,383
	Population (10,000 people)	546	12	12	1	49
	Investment in fixed assets (10,000 yuan)	546	201,685	388,073	3161	2,922,300
	Financial revenue (10,000 yuan)	546	12,100	25,241	73	210,302
	Financial expenditure (10,000 yuan)	546	94,988	92,424	535	697,936