diaporamaMiscDM
 
◃  Ch. 3 Seg  ▹
 

Qualité d'un clustering

Il faut maximiser l'inertie inter-cluster et minimiser l'inertie intra-cluster
schéma clusters
  • G(6; 5.5) ; Itotale = 23.5
  • G1(3; 5.5) G2(9; 5.5) d(G1, G2) = 6
  • d(G, G1) = d(G, G2) = 3 ; IInter (C1, C2) = 9
  • G3(6; 2) G4(6; 9) d(G3, G4) = 7
  • d(G, G3) = d(G, G4) = 3.5 ; IInter (C3, C4) = 12.25
  • IInter (C1, C2) < IInter (C3, C4)
  • IC1 = 14.5
  • IC2 = 14.5
  • IC3 = 11.25
  • IC4 = 11.25