A Novel Discrete Grey Model and Its Application

Table 4

Fitted and predicted values obtained by different grey system models.

Raw data	GM(1,1)	FGM(1,1)	DGM(1,1)	FDGM(1,1)
7
9.4	10.52	10.18	10.56	10.23
12.5	12.21	11.90	12.25	11.95
14.0	14.17	13.90	14.22	13.96
15.9	16.44	16.25	16.50	16.32
19.3	19.09	18.99	19.15	19.07
24.1	22.15	22.19	22.23	22.29
25.8	25.71	25.93	25.80	26.04
28.7	29.84	30.30	29.94	30.43
MAPE	4.05	5.27	4.06	3.97
RMSE	0.92	0.96	0.93	0.97
39.6	34.63	35.41	34.75	35.57
42.2	40.19	41.38	40.33	41.56
MAPE	8.67	6.26	8.33	5.85
RMSE	3.79	3.02	3.67	2.88