| Equation | Model Summary | Parameter Estimates | ||||||
| R Square | F | df1 | df2 | Sig. | Constant | b1 | b2 | |
| Linear | 0.616 | 86.756 | 1 | 54 | 0.000 | ā2201.505 | 1.117 | |
| Logarithmic | 0.614 | 85.776 | 1 | 54 | 0.000 | ā16805.735 | 2215.325 | |
| Quadratic | 0.619 | 87.750 | 1 | 54 | 0.000 | ā1093.851 | 0.000 | 0.000 |
| Exponential | 0.897 | 472.242 | 1 | 54 | 0.000 | 2.84Eā059 | 0.069 | |