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In a subdivided population which is mating at random except for a proportion, E, of marriages which are endogamous in excess of random endogamy, and in which the Wahlund coefficient of inbreeding, which measures gene frequency variance among subdivisions, is Rst, the expected value of Wright’s Fjs, which measures deviation from local Hardy-Weinberg equilibrium, is approximately Rst(E — 1) and is thus negative. This effect and others which have been described combine to make the Fjs parameter nearly uninterpretable.