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Statistical data for different polynomial regression models for modeling caffeine yield.
| Model | Lack of Fit | Adjusted R2 | Predicted R2 |
|---|---|---|---|
| Linear model | 0.02565 | 0.083 | −0.269 |
| A model with two-factor interactions | 0.024206 | 0.136 | −0.570 |
| Second-order model | 0.996154 | 0.917 | 0.936 |
| Cubic model | 0.856 |
