Uc Davis Medical Center · Referral network
HSA 5200 · 2015 · 1152 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
-3,568,782
Median F
-438,430
Min F
-214,882,724
Max F
274
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
1,487
Edges
23,966
Avg clustering
0.633
Density
0.0217
Forman μ
-115.7
Forman σ
148.8
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
524,485
Avg degree
13.89
Max degree
437
Negative F edges
7,958
Positive F edges
42
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 437 · weight 49,883
437
#2
NPI 1942282801
Degree 351 · weight 40,264
351
#3
NPI 1659450047
Degree 197 · weight 23,924
197
#4
NPI 1467524520
Degree 279 · weight 23,839
279
#5
NPI 1245289545
Degree 202 · weight 20,807
202
#6
NPI 1326029794
Degree 190 · weight 20,071
190
#7
NPI 1982686978
Degree 225 · weight 19,210
225
#8
NPI 1013921253
Degree 161 · weight 13,866
161
Most negative curvature
#1
Forman -214,882,724
1497827562 → 1942282801
Weight 1,919 · Forman -214,882,724
#2
Forman -150,557,603
1326029794 → 1497827562
Weight 1,803 · Forman -150,557,603
#3
Forman -145,864,176
1245289545 → 1497827562
Weight 1,645 · Forman -145,864,176
#4
Forman -123,518,584
1497827562 → 1982686978
Weight 1,136 · Forman -123,518,584
#5
Forman -119,201,978
1013921253 → 1497827562
Weight 1,269 · Forman -119,201,978
#6
Forman -113,042,924
1497827562 → 1609857077
Weight 1,190 · Forman -113,042,924
#7
Forman -101,231,592
1336112085 → 1497827562
Weight 1,047 · Forman -101,231,592
#8
Forman -97,349,732
1245289545 → 1942282801
Weight 1,515 · Forman -97,349,732
Strongest referral edges
#1
Weight 1,919
1497827562 → 1942282801
Weight 1,919 · Forman -214,882,724
#2
Weight 1,803
1326029794 → 1497827562
Weight 1,803 · Forman -150,557,603
#3
Weight 1,645
1245289545 → 1497827562
Weight 1,645 · Forman -145,864,176
#4
Weight 1,515
1245289545 → 1942282801
Weight 1,515 · Forman -97,349,732
#5
Weight 1,423
1326029794 → 1942282801
Weight 1,423 · Forman -92,427,166
#6
Weight 1,269
1013921253 → 1497827562
Weight 1,269 · Forman -119,201,978
#7
Weight 1,190
1497827562 → 1609857077
Weight 1,190 · Forman -113,042,924
#8
Weight 1,136
1497827562 → 1982686978
Weight 1,136 · Forman -123,518,584