Table 1. Descriptive statistics of yield for total samples, four yield ranges (15.5% moisture), four different cultivars and four nitrogen (N) levels.
| na | Mean | SDb | Minimum | 25% Qc | Median | 75% Q | Maximum | |
| ----------------------------------Mg ha−1------------------------------ | ||||||||
| Total | 149 | 8.0 | 2.1 | 3.9 | 6.4 | 8.1 | 9.5 | 12.8 |
| Yield ranges (Mg ha−1) | ||||||||
| <7.5 | 58 | 5.9 | 1.0 | 3.9 | 5.2 | 5.9 | 6.7 | 7.4 |
| 7.5–9 | 45 | 8.2 | 0.4 | 7.5 | 7.8 | 8.3 | 8.5 | 9.0 |
| 9–10.5 | 26 | 9.7 | 0.4 | 9.0 | 9.2 | 9.6 | 10.0 | 10.4 |
| >10.5 | 20 | 11.4 | 0.6 | 10.5 | 11.0 | 11.3 | 11.8 | 12.8 |
| Cultivars | ||||||||
| YD | 30 | 5.6 | 1.1 | 3.9 | 4.7 | 5.4 | 6.5 | 8.1 |
| XY | 30 | 8.0 | 1.5 | 3.9 | 7.3 | 8.4 | 9.1 | 10.8 |
| ZD | 75 | 8.5 | 1.9 | 5.0 | 7.2 | 8.3 | 9.8 | 12.8 |
| FY | 14 | 10.2 | 1.2 | 8.1 | 9.5 | 10.4 | 11.0 | 12.0 |
| N levels | ||||||||
| N-0 | 30 | 6.1 | 1.5 | 3.9 | 5.1 | 5.8 | 6.7 | 9.5 |
| N-low | 32 | 8.3 | 2.1 | 4.3 | 7.3 | 8.2 | 9.8 | 11.5 |
| N-opt | 30 | 8.9 | 2.1 | 4.4 | 7.4 | 9.2 | 10.4 | 12.3 |
| N-over | 57 | 8.3 | 1.8 | 4.5 | 7.2 | 8.3 | 9.3 | 12.8 |
na: number of observations.
SDb: standard deviation.
Qc: quartile.