Table 16.

Parameters and MAPEs of the FGBM (1,1,$t^{\alpha }$) model based on different optimization algorithms (non-OECD)

Algorithm	$r$(Parameter 1)	$\lambda$(Parameter 2)	$\alpha$(Parameter 3)	$\xi$(Parameter 4)	MAPE(%)	test_MAPE(%)
GWO	0.2690	0.5229	0.2772	0.1436	0.1489	3.1289
PSO	0.2147	0.5267	4.0000	0.0000	0.1557	1.1457
QGA	0.8747	0.5157	3.9997	0.0691	0.1392	1.0637