Uc Davis Medical Center · Referral network
HSA 5200 · 2017 · 1264 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
-4,910,073
Median F
-397,076
Min F
-283,347,848
Max F
254
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
1,615
Edges
24,129
Avg clustering
0.620
Density
0.0185
Forman μ
-120.5
Forman σ
157.6
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
540,860
Avg degree
12.66
Max degree
435
Negative F edges
7,973
Positive F edges
27
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 1497827562
Degree 435 · weight 55,243
435
#2
NPI 1942282801
Degree 426 · weight 50,360
426
#3
NPI 1215955844
Degree 315 · weight 32,401
315
#4
NPI 1982686978
Degree 334 · weight 30,913
334
#5
NPI 1245289545
Degree 251 · weight 27,466
251
#6
NPI 1659450047
Degree 204 · weight 22,375
204
#7
NPI 1467524520
Degree 229 · weight 20,948
229
#8
NPI 1649314055
Degree 125 · weight 12,849
125
Most negative curvature
#1
Forman -283,347,848
1497827562 → 1942282801
Weight 2,359 · Forman -283,347,848
#2
Forman -192,080,281
1215955844 → 1497827562
Weight 1,860 · Forman -192,080,281
#3
Forman -178,801,368
1497827562 → 1982686978
Weight 1,558 · Forman -178,801,368
#4
Forman -173,849,006
1245289545 → 1497827562
Weight 1,877 · Forman -173,849,006
#5
Forman -169,617,893
1215955844 → 1942282801
Weight 1,637 · Forman -169,617,893
#6
Forman -159,824,134
1942282801 → 1982686978
Weight 1,402 · Forman -159,824,134
#7
Forman -158,448,941
1245289545 → 1942282801
Weight 1,784 · Forman -158,448,941
#8
Forman -95,331,768
1497827562 → 1609857077
Weight 880 · Forman -95,331,768
Strongest referral edges
#1
Weight 2,359
1497827562 → 1942282801
Weight 2,359 · Forman -283,347,848
#2
Weight 1,877
1245289545 → 1497827562
Weight 1,877 · Forman -173,849,006
#3
Weight 1,860
1215955844 → 1497827562
Weight 1,860 · Forman -192,080,281
#4
Weight 1,784
1245289545 → 1942282801
Weight 1,784 · Forman -158,448,941
#5
Weight 1,637
1215955844 → 1942282801
Weight 1,637 · Forman -169,617,893
#6
Weight 1,558
1497827562 → 1982686978
Weight 1,558 · Forman -178,801,368
#7
Weight 1,402
1942282801 → 1982686978
Weight 1,402 · Forman -159,824,134
#8
Weight 1,398
1215955844 → 1245289545
Weight 1,398 · Forman -88,669,319