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

Table 8

Corresponding results of various models of irregular part series.

Model type	Independent variable	Coefficient	𝑡 value	AIC	SC	Residual sum of squares	D-W value
AR(1)	AR(1)	0.83***	10.43	36.78	36.82	2.49𝐸+16	1.28
AR(2)	AR(1)	1.19***	8.75	36.64	36.72	2.03𝐸+16	1.99
	AR(2)	−0.42***	−3.15

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.