Forecasting the Cumulative Confirmed Cases with the FGM and Fractional-Order Buffer Operator in Different Stages of COVID-19

Table 4

The prediction performance.

	FGM		FGM + WBO		GM (1, 1)
	MAPE (%)	RMSE	MAPE (%)	RMSE	MAPE (%)	RMSE
ITA	0.938	1941.600	0.724	1056.425	3.314	4421.660
ESP	0.527	1195.532	0.114	262.480	0.867	2332.846
GBR	1.380	1912.883	1.380	1912.883	4.836	6042.056
JPN	1.370	198.692	0.572	84.863	3.201	576.989
USA	0.453	4070.153	0.464	3822.088	3.932	27981.766
RSA	1.534	9100.926	1.430	8387.564	1.539	9069.371
CHN	0.757	763.740	0.354	303.324	0.576	536.375

ITA, EPS, GBR, JPN, USA, RSA, and CHN indicate Italy, Spain, the United Kingdom, Japan, the United States, the Republic of South Africa, and mainland China separately.