University Of Alabama Hospital · Referral network
HSA 1011 · 2017 · 1507 physicians · 8000 edges
Running from SQLite — no Neo4j required. Regional and HSA dashboards, this force graph, curvature histogram, and hub rankings all work out of the box. Advanced users can optionally load the graph into a self-hosted Neo4j instance (docker compose up -d, then npm run etl-to-neo4j) for the Cypher playground and Neo4j Browser.
Force-directed graph · edges coloured by Forman–Ricci curvature
Loading graph engine…
Curvature distribution
Mean F
-1,504,444
Median F
-191,908
Min F
-123,308,057
Max F
764.6
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
2,131
Edges
37,027
Avg clustering
0.599
Density
0.0163
Forman μ
-107.5
Forman σ
155.7
Rendered graph structure
Live computation on up to 8,000 edges (SQLite row order, node-strength weights). Values will differ from precomputed stats above for large HSAs.
Total weight
490,921
Avg degree
10.62
Max degree
410
Negative F edges
7,938
Positive F edges
62
Nonzero F edges
8,000
Reading the graph
Teal edges have positive Forman curvature — efficient information flow.
Red edges have negative curvature — bottlenecks in the referral graph.
Edge width: log(patient count). Node size: degree-weighted strength.
Hub physicians
#1
NPI 1295745149
Degree 410 · weight 38,577
410
#2
NPI 1881638518
Degree 217 · weight 15,859
217
#3
NPI 1780611913
Degree 159 · weight 15,841
159
#4
NPI 1760471437
Degree 140 · weight 12,409
140
#5
NPI 1740236694
Degree 101 · weight 9,847
101
#6
NPI 1730293093
Degree 125 · weight 9,578
125
#7
NPI 1497744197
Degree 111 · weight 9,173
111
#8
NPI 1871678284
Degree 90 · weight 8,380
90
Most negative curvature
#1
Forman -123,308,057
1295745149 → 1780611913
Weight 1,982 · Forman -123,308,057
#2
Forman -110,860,218
1295745149 → 1881638518
Weight 1,404 · Forman -110,860,218
#3
Forman -75,815,411
1295745149 → 1518983766
Weight 966 · Forman -75,815,411
#4
Forman -75,170,303
1295745149 → 1730293093
Weight 838 · Forman -75,170,303
#5
Forman -74,266,781
1295745149 → 1922252691
Weight 938 · Forman -74,266,781
#6
Forman -70,072,375
1285660159 → 1295745149
Weight 847 · Forman -70,072,375
#7
Forman -65,633,314
1295745149 → 1790705978
Weight 725 · Forman -65,633,314
#8
Forman -65,047,703
1144287038 → 1295745149
Weight 728 · Forman -65,047,703
Strongest referral edges
#1
Weight 1,982
1295745149 → 1780611913
Weight 1,982 · Forman -123,308,057
#2
Weight 1,404
1295745149 → 1881638518
Weight 1,404 · Forman -110,860,218
#3
Weight 1,212
1043335136 → 1184800971
Weight 1,212 · Forman -320,039
#4
Weight 1,148
1780611913 → 1881638518
Weight 1,148 · Forman -30,968,935
#5
Weight 966
1295745149 → 1518983766
Weight 966 · Forman -75,815,411
#6
Weight 938
1295745149 → 1922252691
Weight 938 · Forman -74,266,781
#7
Weight 889
1134339799 → 1659581551
Weight 889 · Forman -268,720
#8
Weight 857
1134339799 → 1265676688
Weight 857 · Forman -270,172