Forecasting Natural Gas Consumption of China Using a Novel Grey Model

Table 4

Fitted values of raw data on China’s natural gas consumption by different grey models.

Raw data	GM (1,1)	DGM (1,1)	ONGM	FNGM
Simulative stage
6273
7735	9051.12	9078.30	6375.82	8322.61
9943	10190.19	10220.02	8238.70	10119.95
10901	11472.62	11505.33	10145.79	11979.98
11764	12916.43	12952.28	12098.14	130904.89
14426	14541.95	14581.20	14096.81	15896.95
17804	16372.04	16414.99	16142.92	17958.48
19303	18432.45	18479.40	18237.59	20091.93
22096	20752.15	20803.44	20381.96	22299.80
24271	23363.79	23419.76	22577.22	24584.68
25364	26304.10	26365.12	24824.58	26949.25
27904	29614.44	29680.89	27125.27	29396.31
Verification stage
31397	33341.38	33413.67	29480.56	31928.72
36192	37537.36	37615.90	31891.74	34549.47