| Confidence level | Bootstrap | Coefficient of skewness | |
| Hard wheat index | 90% | symmetric | asymmetric |
| 95% | symmetric | symmetric | |
| 99% | symmetric | symmetric | |
| Cotton index | 90% | symmetric | symmetric |
| 95% | symmetric | symmetric | |
| 99% | symmetric | symmetric | |
| Sugar index | 90% | symmetric | asymmetric |
| 95% | symmetric | symmetric | |
| 99% | symmetric | symmetric | |
| Soybean oil index | 90% | asymmetric | asymmetric |
| 95% | asymmetric | asymmetric | |
| 99% | asymmetric | asymmetric |