Valeurs de référence pour le calcul du chi2 + degrés de liberté

 x2, dof = sufficient_statistics ( data, dico, 1,2,[3])
 3.94665911866  2

 x2, dof = sufficient_statistics ( data, dico, 0,1,[2])
 2.11949290586  2

 x2, dof = sufficient_statistics ( data, dico, 0,1,[2,3,4])
 7.57130370024 6

 x2, dof = sufficient_statistics ( data, dico, 0,3,[3,4])
 0.0 4

 x2, dof = sufficient_statistics ( data, dico, 1,2,[3,4])
 3.51721104306 4