Table 14.

Error metrics of CO₂ emissions of total world

Fitting	NGM	SIGM	GMP	FGM	NGBM(1,1,k,c)	FAGM(1,1,$t^{\alpha }$)	FGBM
MAPE(%)	0.2061	0.1857	0.2107	0.1979	0.1861	0.1972	0.168
MAE	66.8934	60.4641	68.3522	64.4834	60.6642	64.1159	54.7167
Prediction	NGM	SIGM	GMP	FGM	NGBM(1,1,k,c)	FAGM(1,1,$t^{\alpha }$)	FGBM
MAPE(%)	2.5802	2.5742	2.8412	3.1157	2.9172	2.7641	2.3515
MAE	876.8394	874.8306	965.4436	1058.7825	991.3511	939.5525	799.2845