Table 4.

Regression results of main influencing factors on EISD (n = 20)

Emergy index for sustainable development
Independent variable	Standardization coefficient	t	P	R2	D-W value	F
Constant	–	1.021	0.283	0.989	1.678	F(5,14) = 227.625, p = 7.0863E-13
Social fixed asset investment	1.477	3.851	0.002**
Raw coal emergy	− 0.199	− 2.014	0.065
Grain emergy	0.315	3.310	0.006**
Input emergy	− 0.357	− 0.773	0.479
Output resources	− 1.875	− 7.927	0.000002**

*p < 0.05 **p < 0.01