| Explanatory variables | Estimated coefficients | p-value |
| φ1 | 1.40103 | <0.0004 |
| φ1 | −0.401645 | <0.0004 |
| θ1 | 0.849380 | <0.0004 |
| γ1 | 0.708207 | <0.0004 |
| δ1 | 1.67546 | <0.0004 |
| δ2 | −0.756086 | <0.0004 |