Range and Levels | |||||
Variables | −α (1.681) | Low (−1) | Central (0) | High (1) | +α (1.681) |
X1 (OLR) | 1 | 2.6 | 6 | 11 | 14.409 |
X2 (C/N) | 13.182 | 20 | 30 | 40 | 46.817 |
X3 (HRT) | 1.954 | 4 | 7 | 10 | 12.045 |