Fractional-Order Accumulative Linear Time-Varying Parameters Discrete Grey Forecasting Model

Table 2

Predicted values and predicted errors of different grey prediction models.

Year	Original value	DGM(1,1) model		TVGM(1,1) model		FTDGM(1,1) model
		Predicted value	Relative error (%)	Predicted value	Relative error (%)	Predicted value	Relative error (%)
2010	46013	48326.89	5.03	44920.35	2.37	44989.65	2.22
2011	53210	56295.98	5.80	49471.34	7.03	50379.20	5.32
2012	57068	65579.18	14.91	54030.11	5.32	56267.53	1.40
2013	62475	76393.18	22.28	58593.05	6.21	62739.40	0.42
2014	67792	88990.4	31.27	63158.22	6.83	69893.15	3.10
MAPE			15.86		5.55		2.49

MAPE (mean absolute percentage error) = .