A Combined Model of Global Cultivated Area Change and Prediction for Future: 1961–2020

Table 6

Evaluation results of various first difference series models of global cultivated area.

Model type	Coefficient	𝑡 value	AIC	SC	Residual sum of squares	D-W value
AR(1)	𝜑=0.39^∗∗∗	2.83	36.85	36.89	2.59𝐸+16	1.91
AR(2)	𝜑1=0.43^∗∗∗	2.85	36.90	36.98	2.56𝐸+16	1.99
	𝜑2=−0.11	−0.70

Note: ***means significance under the level of 0.01, **means significance under the level of 0.05, and *means significance under the level of 0.1.