| Variable | Coef. | Std. Err. | t | P > |t| |
| βpi | −0.0074055 | 0.0045562 | −1.6253638 | 0.246 |
| Constant | 0.0122269 | 0.0051306 | 2.3831171 | 0.140 |
| R-squared | 0.569 |
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| Adj R-squared | 0.353 |
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