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| parameter | value |
|---|---|
| bias | 0.7969 |
| X6 | 0.1103 |
| X7 | 0.5616 |
| X8 | –0.0107 |
| X9 | –0.2002 |
| X6 × X7 | 0.3348 |
| X6 × X8 | –0.0325 |
| X6 × X9 | –0.0738 |
| X7 × X8 | –0.1305 |
| X7 × X9 | –0.0548 |
| X8 × X9 | 0.0145 |
| (X6)2 | –0.1686 |
| (X7)2 | –0.6016 |
| (X8)2 | –0.0402 |
| (X9)2 | 0.0309 |
