| Node |
Premises (i.e. pig holdings, gathering areas, markets and slaughterhouses which have moved at least one pig during a particular period of time). |
| Edge |
Directed movement of pigs between two premises11. |
| Clustering coefficient (CC) |
Probability that two premises that are both in direct contact with the same premises are also directly connected to each other55. |
| Average path length (APL) |
Shortest path among two premises averaged over all pairs of premises in the network55. A path consists of the number of edges between two nodes. |
| Degree |
Number of incoming (in-degree) and outgoing (out-degree) movements from a premise to other premises11. |
| Giant strong component (GSC) size |
Number of premises which are all directly or indirectly connected with each other4. |
| Small-world |
Network characterised by high clustering and short path length55. |
| Scale-free |
Network where the out-degree and in-degree distributions fit a power law distribution56. |
| Trade community |
Subsets of nodes which have significantly more edges (trade connections) than expected by chance62. Modularity measure quantifies the quality of the community structure59. |
