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consiste à forcer les groupes à comparer à être similairesvis-à-vis de la distribution du facteur de confusion connu● L'appariement : consiste à recruter chaque sujet témoin enfonction du cas recruté● L'assortiment de fréquence : on décrit la distributiondu facteur de confusion dans le groupe des cas, puis on choisit un groupe de sujets témoins
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