Table 1.
Parameters describing dispersal probabilities in a seed system network
| Parameter | Definition | Values | Comments |
|---|---|---|---|
| β | Exponent of the power law, where β>0 | 0.0001–0.9 (0.0001, 0.01, 0.1, 0.2, 0.3,a 0.4,a0.5,a 0.6, 0.7, 0.8, 0.9) | Larger values of β result in steeper declines in the probability of movement with distance and thus, fewer village-to-village links |
| λ | Scale parameter of the exponential model | 0.000001–0.002 (0.0000001, 0.00001,a0.00005,a 0.0001,a 0.001,a 0.002) | Larger values of λ result in fewer village-tovillage links; probability of a link declines exponentially with distance |
| φ | Probability of transmission of infection at each time step over an established link from an infected node to a susceptible node | 0.1a | Applied to both seller-to-village and village-to-village links |
a
Value that was used as the default in simulation experiments.