Forecasting Natural Gas Consumption of China Using a Novel Grey Model

Table 2

Fitted values and statistical indices by different grey models.

Raw data	GM (1,1)	DGM (1,1)	ONGM (1,1)	FNGM
0.155
1.11	1.76	1.77	0.84	1.37
1.92	2.06	2.07	1.46	2.04
2.24	2.40	2.42	2.06	2.67
3.03	2.81	2.82	2.65	3.27
3.33	3.28	3.29	3.22	3.84
4.16	3.82	3.84	3.78	4.38
4.64	4.47	4.49	4.33	4.89
5.18	5.21	5.24	4.87	5.37
5.60	6.09	6.11	5.39	5.83
RMSE	0.32	0.32	0.31	0.30
MAE	0.25	0.25	0.29	0.27
MAPE	11.44	11.63	10.86	10.06
6.25	7.11	7.13	5.90	6.26
6.39	8.30	8.33	6.40	6.67
7.35	9.69	9.72	6.88	7.06
RMSE	2.95	2.99	0.46	0.02
MAE	1.70	1.73	0.28	0.19
MAPE	25.16	25.56	4.05	2.83