Combined Prediction of Clean Energy Consumption in China Based on the Nonlinear Programming Model

Table 3

ADF test results after first-order difference.

		t-Statistic	Prob
Augmented Dickey–Fuller test statistic	254.712	−9.3380	0.0000
Test critical values	1% level	−4.7283
	5% level	−3.7597
	10% level	−3.3249