Table 2. Perturbation of invaded area with time for each parameter.
| Model | Parameters | t = 8 | t = 18 | t = 28 | |
| Model A“worst” | Relative rate of increase | r | 0.50 | 0.91 | 0.36 |
| Model A“best” | Relative rate of increase | r | 0.46 | 0.94 | 0.39 |
| Model B | Spread rate | c | 0.35 | 0.26 | 0.12 |
| Model C | Yearly multiplication factor | λmax | 0.85 | 0 | 0.02 |
| Carrying capacity | Pmax | −0.48 | 0 | 0 | |
| Model D | Yearly multiplication factor | λmax | ND (*) | 0.50 | 0 (¤) |
| Carrying capacity | Pmax | ND (*) | −0.10 | 0 (¤) | |
| Scale parameter | u | ND (*) | −0.01 | 0 (¤) | |
| Shape parameter | ν | ND (*) | −0.02 | 0 (¤) |
A value of zero means that the scaled area does not change with a change of the parameter +/−10%. (*) ND means that the value is not defined because the invaded area for the baseline value is 0. (¤) These values are all below 4×10−3.