Forecasting of Wastewater Discharge and the Energy Consumption in China Based on Grey Model

Table 5

Deviation indexes of forecasting results for different forecasting methods.

Method	MAPE(%)	MAE	MSE
GM(0,2) model	2.48	0.0842	0.0540
IGM(0, 2) model	1.53	0.0090	0.0036