Table 4 Parameter selection: Poisson signal threshold (\(\tau _1\))
From: Real-time spatio-temporal event detection on geotagged social media
\(\tau _1\) value | 0.01 | 0.005 | 0.0025 | 0.0013 | 0.0006 | 0.0003 | 0.0001 |
|---|---|---|---|---|---|---|---|
Phase | Poisson signal | ||||||
Signal thresholding | 6846 | 4821 | 3546 | 2458 | 1884 | 1557 | 1288 |
Merging adjacent \(\Delta T\) events | 6144 | 3882 | 2748 | 1763 | 1268 | 992 | 761 |
Event duration D \(\ge \theta _{duration}\) | 40 | 27 | 16 | 11 | 7 | 3 | 2 |
Filtering propagated events | 21 | 17 | 11 | 8 | 5 | 1 | 1 |
Spam filtering | 16 | 11 | 8 | 6 | 5 | 1 | 1 |
Phase | Smoothing signal | ||||||
|---|---|---|---|---|---|---|---|
Signal thresholding | 3332 | 2462 | 1931 | 1573 | 1315 | 1060 | 927 |
Merging adjacent \(\Delta T\) events | 2292 | 1604 | 1188 | 923 | 726 | 519 | 424 |
Event duration D \(\ge \theta _{duration}\) | 51 | 29 | 16 | 8 | 6 | 3 | 2 |
Filtering propagated events | 29 | 22 | 11 | 6 | 5 | 2 | 1 |
Spam filtering | 23 | 15 | 8 | 4 | 4 | 2 | 1 |