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La fréquence d'une valeur du caractère est égale à l'effectif de cette valeur divisé par l'effectif total. f=n/N.Ainsi, effectif et fréquence sont proportionnels.C'est un nombre compris entre 0 et 1. On peut l'exprimer sous forme décimale, fractionnaire, ou en pourcentage La somme de toutes les fréquences vaut toujours 1 ou 100 % .
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