| Model | Number of Predictors | Model Fit Statistics | Ljung-Box Q (18) | Number of Outliers | ||
| Stationary R-squared | Statistics | DF | Sig. | Stationary R-squared | Statistics | |
| GDP in billion US$-Model_1 | 1 | 0.616 | 181.207 | 18 | 0.000 | 0 |