Research Article
Nickel Price Forecast Based on the LSTM Neural Network Optimized by the Improved PSO Algorithm
Table 5
The Ljung–Box test results of the residual square sequence of the ARIMA(1, 1, 2).
| Lag | AC | Q | -value |
| 1.0 | 0.001880 | 0.000407 | 0.983911 | 2.0 | −0.013717 | 0.022247 | 0.988938 | 3.0 | 0.240741 | 6.811112 | 0.078168 | 4.0 | 0.060478 | 7.243522 | 0.123565 | 5.0 | 0.006430 | 7.248456 | 0.202808 | 6.0 | 0.191994 | 11.688549 | 0.069289 | 7.0 | 0.073203 | 12.340164 | 0.089913 | 8.0 | 0.060502 | 12.78956 | 0.119298 | 9.0 | 0.048683 | 13.083349 | 0.158871 | 10.0 | 0.184445 | 17.341826 | 0.067134 | 11.0 | 0.111246 | 18.906318 | 0.062796 | 12.0 | −0.011588 | 18.923464 | 0.090392 |
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