Table 8.
Summary of curve estimation models and parameter estimates.
| Model | Model Summary | Parameter Estimates | |||||||
|---|---|---|---|---|---|---|---|---|---|
| R2 | F | df1 | df2 | Sig. | Constants | b1 | b2 | b3 | |
| Linear | 0.982 | 162.844 | 1 | 3 | 0.001 | 1206.105 | 2.306 | ||
| Logarithmic | 0.937 | 44.455 | 1 | 3 | 0.007 | −6921.337 | 1500.012 | ||
| Quadratic | 0.992 | 130.818 | 2 | 2 | 0.008 | 1815.085 | 0.405 | 0.001 | |
| Three times | 0.993 | 49.190 | 3 | 1 | 0.104 | 1177.880 | 3.477 | −0.003 | 2.186 × 10−6 |
| Composite | 0.991 | 329.357 | 1 | 3 | 0.000 | 1570.584 | 1.001 | ||
| Power | 0.964 | 80.619 | 1 | 3 | 0.003 | 87.136 | 0.533 | ||
Dependent variable: Carbon emissions. Independent variable: UCL area.