For a pattern to be valid there must be a logical or causative connection between the clustered behaviors, not just a spurious correlation.
如果模式有效，那么在聚集的行为间就必然会有逻辑或者因果关系，而不仅仅是假想的关联。
Even if the correlation were not spurious, it would be difficult to know which way causation ran.
即使这个联系不是错误的，也很难知道这种因果关系是以哪种方式运行的。
Even if the correlation were not spurious, it would be difficult to know which way causation ran.
即使这个联系不是错误的，也很难知道这种因果关系是以哪种方式运行的。
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