Table 5.

The final model performance evaluation on the COVID-19 daily deaths.

n-Day Forward Chaining	Block	Training Period	Forecasted Period	RMSE	MAE	MAPE (%)	U1
7-day interval	1	1 Dec 21–2 Apr 22	3–9 Apr 22	4.88	4.01	4.37	0.03
	2	1 Dec 21–9 Apr 22	10–16 Apr 22	11.45	9.59	8.27	0.05
	3	1 Dec 21–16 Apr 22	17–23 Apr 22	2.98	2.63	2.05	0.01
	4	1 Dec 21–23 Apr 22	24–30 Apr 22	13.68	13.40	10.70	0.05
			Average	8.25	7.41	6.35	0.04
14-day interval	1	1 Dec 21–2 Apr 22	3–16 Apr 22	7.19	5.35	5.02	0.03
	2	1 Dec 21–16 Apr 22	17–30 Apr 22	10.31	8.30	6.60	0.04
			Average	8.75	6.83	5.81	0.04
28-day interval	1	1 Dec 21–2 Apr 22	3–30 Apr 22	8.90	6.90	5.82	0.04