An association is not necessarily a causal relationship.
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送交者: zzzz2008 于 2007-04-30, 14:31:12:
回答: 近视率与学历高低有关只是表明但是不能证明环境因素的影响 由 方舟子 于 2007-04-30, 14:15:35:
However, it doesn't mean that the associaton is not a causal relationship. You need evidence to say that an association is not causal and results from other confounding factors.
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