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Statistical summary of SOM developed from each strategy by using the random forest (RF) algorithm.
| Strategy | Number of mtry | Calibration (n = 112) | Validation (n = 56) | |||
|---|---|---|---|---|---|---|
| R 2 c | RMSEc (g kg−1) | R 2 V | RMSEv (g kg−1) | RPIQ | ||
| 1DV | 3 | 0.44 | 6.35 | 0.43 | 7.08 | 1.45 |
| 2DI | 5 | 0.74 | 4.39 | 0.70 | 5.23 | 1.97 |
| 3DI | 1 | 0.89 | 2.85 | 0.90 | 3.27 | 3.15 |
| 1DV+2DI | 10 | 0.83 | 3.71 | 0.82 | 4.16 | 2.48 |
| 1DV+3DI | 8 | 0.91 | 2.86 | 0.90 | 2.96 | 3.48 |
| 2DI+3DI | 8 | 0.94 | 2.29 | 0.93 | 2.52 | 4.09 |
