Yale-New Haven Hospital · Referral network
HSA 7013 · 2016 · 1215 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
-6,008,950
Median F
-398,308
Min F
-293,991,170
Max F
293.6
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
1,575
Edges
28,315
Avg clustering
0.606
Density
0.0228
Forman μ
-178.9
Forman σ
222.8
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
411,234
Avg degree
13.17
Max degree
707
Negative F edges
7,960
Positive F edges
40
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 1558359752
Degree 707 · weight 56,080
707
#2
NPI 1972591063
Degree 422 · weight 25,239
422
#3
NPI 1619159050
Degree 324 · weight 23,317
324
#4
NPI 1831351402
Degree 286 · weight 18,726
286
#5
NPI 1952344418
Degree 261 · weight 16,233
261
#6
NPI 1790731354
Degree 253 · weight 16,065
253
#7
NPI 1063513703
Degree 226 · weight 14,211
226
#8
NPI 1124039490
Degree 216 · weight 11,535
216
Most negative curvature
#1
Forman -293,991,170
1558359752 → 1972591063
Weight 1,594 · Forman -293,991,170
#2
Forman -183,007,891
1033119524 → 1558359752
Weight 930 · Forman -183,007,891
#3
Forman -179,808,703
1124039490 → 1558359752
Weight 875 · Forman -179,808,703
#4
Forman -173,153,471
1306909825 → 1558359752
Weight 866 · Forman -173,153,471
#5
Forman -141,124,024
1245493428 → 1558359752
Weight 614 · Forman -141,124,024
#6
Forman -133,505,093
1558359752 → 1821009960
Weight 522 · Forman -133,505,093
#7
Forman -119,181,649
1558359752 → 1972717395
Weight 442 · Forman -119,181,649
#8
Forman -112,715,305
1558359752 → 1831351402
Weight 302 · Forman -112,715,305
Strongest referral edges
#1
Weight 1,594
1558359752 → 1972591063
Weight 1,594 · Forman -293,991,170
#2
Weight 1,416
1003806456 → 1013907476
Weight 1,416 · Forman -4,846,114
#3
Weight 1,117
1831207018 → 1851440077
Weight 1,117 · Forman -2,122,020
#4
Weight 930
1033119524 → 1558359752
Weight 930 · Forman -183,007,891
#5
Weight 921
1619159050 → 1831351402
Weight 921 · Forman -59,547,203
#6
Weight 906
1003806456 → 1235177767
Weight 906 · Forman -2,367,610
#7
Weight 875
1124039490 → 1558359752
Weight 875 · Forman -179,808,703
#8
Weight 866
1306909825 → 1558359752
Weight 866 · Forman -173,153,471