Research Article
Effect of Ap-Index of Geomagnetic Activity on S&P 500 Stock Market Return
Table 4
Augmented Dickey-Fuller (ADF) Test Results.
| ā | Variable | Dickey-Fuller | Lag | p-value | Conclusion |
| Unit root test for primary level | SMI | -0.66 | 6 | 0.9731 | Not Stationary | DGD | -2.75 | 6 | 0.2618 | Not Stationary |
| Cointegration test | ā | -5.55 | 6 | <0.01 | Stationary |
| Unit root test for differenced | SMI | -7.84 | 6 | <0.01 | Stationary | DGD | -5.57 | 6 | <0.01 | Stationary |
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