Predicting Spare Parts Inventory of Hydropower Stations and Substations Based on Combined Model

Table 3

RMSE and MAE of three prediction methods.

Equipment	RMSE			MAE
	ARMA	ARMA + BP	Combined model	ARMA	ARMA + BP	Combined model
LCD	1.1365	0.8416	0.6770	0.8751	0.6251	0.4583
CPU	1.3693	0.9128	0.7905	0.9583	0.5833	0.5416
DCPS	1.7440	1.5679	1.1902	1.4583	1.2916	0.9167