k | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
RMSE | 0.546 | 0.520 | 0.482 | 0.467 | 0.443 | 0.428 | 0.407 |
MAPE | 10.7% | 10.2% | 10.0% | 9.7% | 9.3% | 9.2% | 9.0% |