Table 4 NNI analysis of cultural heritage sites in the six historical periods
Period | Expected mean distance/meters | Observed mean distance/meters | Nearest neighbor index | Z-score | P-value | Pattern |
|---|---|---|---|---|---|---|
Pre-Sui | 4980.95 | 5982.01 | 1.2010 | 1.3863 | 0.1657 | Random |
Sui and Tang | 5127.65 | 6592.83 | 1.2857 | 2.2538 | 0.0242 | Dispersed |
Five Dynasties to Song | 4068.75 | 3811.62 | 0.9368 | − 0.6282 | 0.5299 | Random |
Yuan and Ming | 3394.08 | 2122.83 | 0.6255 | − 4.4748 | 0.0000 | Clustered |
Qing | 2432.07 | 1308.05 | 0.5378 | − 8.4805 | 0.0000 | Clustered |
Modern Times | 2380.86 | 1264.08 | 0.5309 | − 8.7923 | 0.0000 | Clustered |