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clustering coefficient

a guest Apr 5th, 2016 59 Never
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  1. [source,cypher]
  2. ----
  3. create (_16:`Person` {`name`:"c0"})
  4. create (_17:`Person`)
  5. create (_18:`Person`)
  6. create (_19:`Person`)
  7. create (_20:`Person` {`name`:"c1"})
  8. create (_21:`Person`)
  9. create (_22:`Person`)
  10. create (_23:`Person`)
  11. create (_24:`Person` {`name`:"c2"})
  12. create (_25:`Person`)
  13. create (_26:`Person`)
  14. create (_27:`Person`)
  15. create (_28:`Person` {`name`:"c3"})
  16. create (_29:`Person`)
  17. create (_30:`Person`)
  18. create (_31:`Person`)
  19. create _16-[:`KNOWS`]->_19
  20. create _16-[:`KNOWS`]->_17
  21. create _16-[:`KNOWS`]->_18
  22. create _20-[:`KNOWS`]->_22
  23. create _20-[:`KNOWS`]->_23
  24. create _20-[:`KNOWS`]->_21
  25. create _21-[:`KNOWS`]->_22
  26. create _24-[:`KNOWS`]->_26
  27. create _24-[:`KNOWS`]->_27
  28. create _24-[:`KNOWS`]->_25
  29. create _25-[:`KNOWS`]->_26
  30. create _25-[:`KNOWS`]->_27
  31. create _28-[:`KNOWS`]->_29
  32. create _28-[:`KNOWS`]->_30
  33. create _28-[:`KNOWS`]->_31
  34. create _29-[:`KNOWS`]->_30
  35. create _29-[:`KNOWS`]->_31
  36. create _30-[:`KNOWS`]->_31
  37. ----
  38.  
  39. Query returning wrong results (comparing with https://en.wikipedia.org/wiki/Clustering_coefficient#Local_clustering_coefficient)
  40.  
  41. [source,cypher]
  42. ----
  43. MATCH (a)-[:KNOWS]-()-[r:KNOWS]-()-[:KNOWS]-(a)
  44. WHERE exists(a.name)
  45. WITH a, count(distinct r) AS connected_neighbours
  46. WHERE connected_neighbours>1
  47. RETURN a.name, toFloat(connected_neighbours)/(connected_neighbours*(connected_neighbours-1))
  48. ----
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