C'est en particulier ce que l'on utilise si Y est qualitative. Dans ce cas, on peut chercher P(y=0) ; mais comme une probabilité est toujours comprise entre 0 et 1, on n'arrivera pas à l'exprimer comme combinaison linéaire de variables quantitatives auxquelles on ajoute du bruit. On applique alors à cette probabilité une bijection g entre l'intervalle [0;1] et la droite réelle (on dit que g est un lien). On essaye alors d'exprimer g(P(y=0)) comme combinaison linéaire des variables prédictives.
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tirages au sort I95


knnTree Construct or predict with k-nearest-neighbor classifiers, using cross-validation to select k, choose variables (by forward or backwards selection), and choose scaling (from among no scaling, scaling each column by its SD, or scaling each column by its MAD). The finished classifier will consist of a classification tree with one such k-nn classifier in each leaf.

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