| Equation | TFE | TMS | AFM | ||||||
| R Square | F | Sig. | R Square | F | Sig. | R Square | F | Sig. | |
| Linear | 0.085 | 35.329 | .000 | 0.067 | 27.383 | 0.000 | 0.249 | 125.829 | 0.000 |
| Logarithmic | 0.073 | 29.919 | 0.000 | 0.066 | 26.667 | 0.000 | 0.230 | 113.194 | 0.000 |
| Inverse | 0.052 | 20.978 | 0.000 | 0.056 | 22.570 | 0.000 | 0.181 | 83.728 | 0.000 |
| Quadratic | 0.089 | 18.490 | 0.000 | 0.068 | 13.785 | 0.000 | 0.250 | 63.204 | 0.000 |
| Cubic | 0.090 | 12.386 | 0.000 | 0.068 | 9.185 | 0.000 | 0.263 | 44.959 | 0.000 |
| Compound | 0.080 | 32.931 | 0.000 | 0.065 | 26.303 | 0.000 | 0.235 | 116.996 | 0.000 |
| Power | 0.074 | 30.549 | 0.000 | 0.066 | 26.664 | 0.000 | 0.222 | 108.162 | 0.000 |
| Exponential | 0.080 | 32.931 | 0.000 | 0.065 | 26.303 | 0.000 | 0.235 | 116.996 | 0.000 |
| Logistic | 0.080 | 32.931 | 0.000 | 0.049 | 19.628 | 0.000 | 0.235 | 116.996 | 0.000 |