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Quel problème survient quand on estime et teste un modèle sur une base de données divisée en deux aléatoirementa) On obtient des taux d'erreur diYérents si on réalise l'opération plusieurs foisb) On obtient un modèle avec trop peu d'observations pour évaluer la performance du modèlec) On obtient un modèle trop flexibled) Une autre réponse
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