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统计学家在比较不同的国家时,会要求相称数据(commensurate data)。比如,要比较入学率,研究者需要统计各国在册学生数量,将其与所有学龄儿童比较(尽管即便是是这样的方法,在许多发展中国家仍然存在困难,这些国家的记录未必是标准化的)。

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