Research Article
Nickel Price Forecast Based on the LSTM Neural Network Optimized by the Improved PSO Algorithm
Table 1
The results of two ADF tests.
| | Test item | Test result of original sequence | Test result of processed sequence |
| | Test statistic value | −2.2601036330998725 | −8.7048239142842423 | | -value | 0.18515824547409387 | 0.00000000000003725 | | Critical value (1%) | −3.4786478891750301 | −3.4765979175374011 | | Critical value (5%) | −2.8827217656441682 | −2.8818291230495543 | | Critical value (10%) | −2.5780653266120561 | −2.5775887982253085 |
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