Nickel Price Forecast Based on the LSTM Neural Network Optimized by the Improved PSO Algorithm

Table 6

Prediction errors of the five models.

	ARIMA(1, 1, 2)	ARIMA(1, 1, 1)	ARIMA(3, 1, 2)	ARIMA(0, 1, 2)	ARIMA(3, 1, 3)
RMSE	633.96	636.84	640.12	640.37	644.39
MAE	508.45	510.32	508.59	511.50	524.97
MAPE (%)	4.61	4.63	4.61	4.63	4.80