Table 2. Parameters of the clusters provided by the k-mean algorithm for the category, Open Country. ∗∗∗ indicates a significant difference (t-test, p < .001) between the cluster in term for FD or SA. (ns) indicates that differences were not significant.
| FD (ms) | SA(t − 1) | Number of cases | % | |
| Cluster 1 | 168.6 | 10.86 | 4,057 | 28.81 |
| Cluster 2 | 170.19(ns) | 2.52∗∗∗ | 10,022 | 71.18 |
| FD (ms) | SA(t + 1) | Number of cases | % | |
| Cluster 1 | 169.07 | 10.89 | 4,330 | 28.85 |
| Cluster 2 | 170.54(ns) | 2.51∗∗∗ | 10,678 | 71.14 |