Analysis of the Impact of High-Speed Railway on County Economic Development Based on the Synthetic Control Method: The Hubei Province in China

Table 2

Descriptive statistics of variables.

Variable	Sample size	Mean	Standard deviation	Minimum	Maximum
lngdp	918	13.33	0.919	11.15	15.62
lnfirstprod	884	12.00	0.766	10.21	13.82
secondprop	918	37.93	10.83	12.28	67.23
lnsecondprod	884	12.31	1.120	9.444	15.07
thirdprop	918	33.70	6.342	10.22	55.88
lnthirdprod	884	12.21	0.939	9.564	14.63
lnfixasset	918	12.70	1.362	9.842	15.56
lnfinancialex	918	11.44	1.092	8.964	13.63
lnsaving	918	12.85	1.039	9.930	15.12

lngdp represents the logarithm of GDP; firstprop, secondprop, and thirdprop, respectively, represent the ratio of the added value of the primary, second, and tertiary industry to GDP; lnfirstprod, lnsecondprod, and lnthirdprod, respectively, represent logarithm of the added value of the primary, second, and tertiary industries; lnfixasset represents the logarithm of fixed asset investment, lnfinancialex represents the logarithm of fiscal expenditure, and lnsaving represents the logarithm of the balance between urban and rural residents’ savings.