| Step | 1 | 2 | 3 |
| Constant | 144.30 | 155.43 | −95.54 |
| Plant Heading | 0.421 | 0.412 | 0.406 |
| T-Value | 5.37 | 5.76 | 5.59 |
| P-Value | 0.000 | 0.000 | 0.000 |
| Plant Height | −1.11 | −1.11 |
|
| T-Value | −1.62 | −1.64 |
|
| P-Value | 0.112 | 0.108 |
|
| Tiller Count | 0.4 |
|
|
| T-Value | 0.31 |
|
|
| P-Value | 0.759 |
|
|
| Panicle Length | 0.704 | 0.711 | 0.691 |
| T-Value | 8.50 | 9.06 | 8.76 |
| P-Value | 0.000 | 0.000 | 0.000 |
| R-Sq | 76.71 | 76.67 | 75.30 |
| R-Sq (Adj) | 74.64 | 75.14 | 74.25 |