Yale-New Haven Hospital · Referral network
HSA 7013 · 2014 · 1164 physicians · 7774 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
-8,299,265
Median F
-492,106
Min F
-464,737,211
Max F
198
From referral_network_features
Precomputed on the full thresholded network (all edges, Python toolkit, unit node weights).
Nodes
1,461
Edges
25,149
Avg clustering
0.628
Density
0.0236
Forman μ
-176.9
Forman σ
230.3
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
434,851
Avg degree
13.36
Max degree
705
Negative F edges
7,741
Positive F edges
33
Nonzero F edges
7,774
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 705 · weight 63,268
705
#2
NPI 1972591063
Degree 578 · weight 42,113
578
#3
NPI 1619159050
Degree 323 · weight 28,876
323
#4
NPI 1790731354
Degree 267 · weight 20,209
267
#5
NPI 1952344418
Degree 262 · weight 18,534
262
#6
NPI 1063513703
Degree 253 · weight 17,762
253
#7
NPI 1306909825
Degree 251 · weight 13,689
251
#8
NPI 1821009960
Degree 180 · weight 10,058
180
Most negative curvature
#1
Forman -464,737,211
1558359752 → 1972591063
Weight 2,270 · Forman -464,737,211
#2
Forman -246,491,578
1306909825 → 1558359752
Weight 1,346 · Forman -246,491,578
#3
Forman -201,149,781
1033119524 → 1558359752
Weight 982 · Forman -201,149,781
#4
Forman -185,842,798
1558359752 → 1821009960
Weight 832 · Forman -185,842,798
#5
Forman -182,060,677
1558359752 → 1972717395
Weight 851 · Forman -182,060,677
#6
Forman -169,900,093
1326059510 → 1558359752
Weight 720 · Forman -169,900,093
#7
Forman -133,054,243
1306909825 → 1972591063
Weight 992 · Forman -133,054,243
#8
Forman -124,578,476
1124039490 → 1558359752
Weight 402 · Forman -124,578,476
Strongest referral edges
#1
Weight 2,270
1558359752 → 1972591063
Weight 2,270 · Forman -464,737,211
#2
Weight 1,346
1306909825 → 1558359752
Weight 1,346 · Forman -246,491,578
#3
Weight 1,100
1063513703 → 1619159050
Weight 1,100 · Forman -66,239,086
#4
Weight 1,053
1619159050 → 1790731354
Weight 1,053 · Forman -68,532,411
#5
Weight 1,002
1013907476 → 1194715540
Weight 1,002 · Forman -3,901,424
#6
Weight 992
1306909825 → 1972591063
Weight 992 · Forman -133,054,243
#7
Weight 987
1619159050 → 1952344418
Weight 987 · Forman -63,974,195
#8
Weight 982
1033119524 → 1558359752
Weight 982 · Forman -201,149,781