Pratique des Biostatistiques
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 Dernière modification: 16 avril 2010

Diagramme de Venn

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Schématiquement, des événements peuvent être représentés sous la forme d'ensembles "emboîtés" les uns dans les autres pour former un diagramme de Venn.

Diagramme de Venn

Soit l'étude porte sur les drosophiles. Dans la population de drosophiles (en rose), il existe des drosophiles avec des ailes normalement constituées et des drosophiles avec des yeux rouges.

Dans le calcul des probabilités, les formules employées font apparaître les lettres: A et B. Nous utiliserons la convention suivante:

Dans une problématique donnée, le premier événement cité sera nommé A et le second B. Dans l'exemple, l'événement A est l'événement "avoir des ailes normales" et B "avoir des yeux rouges".