Same clusters, two answers
DBSCAN: crash volume
Circle area scales with crashes. Solid rings are the 20 busiest clusters.
Top 20 by volumeOther clusters5, 8, 12 min to trauma care
ESRI Gi*: severity hot spots
Severity-weighted z-score in a 3 km band. Size follows |z|.
Hot, p < 0.05Hot, p < 0.10ColdNot significant
Why the Gi* map is the one to trust
The busiest clusters are not the most dangerous
Volume rank vs. severity rank
Each line runs from a cluster's DBSCAN volume rank to its Gi* rank. Red lines are Gi* hot spots; dark lines are the 20 busiest clusters.
Who reaches trauma care in time
Drive time from the nearest Level-1 adult trauma center, from ArcGIS Network Analyst service areas.
The hot spots DBSCAN ranks low
| Cluster | Community area | Crashes | Volume rank | Fatal | Severe | Gi* z | p | Trauma access |
|---|