（2）关联和相关（Association and Correlation） 关联规则从本质上讲是条件概率：A发生时，B同时也出现的概率是多大？只要B离50％较远，就是有意义的。
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人们也能看到具体的行为如何与时间和空间背景相关联。
One is also able to see how specific acts are related to a temporal and spatial context.
他建议把7岁儿童的班级大小和考试结果相关联。
He suggested a link between class size and test results of seven-year-olds.
在一个相关联的发展进程中，博物馆和名胜古迹与主题公园之间的明显区别正在逐渐消失。
In a related development, the sharp distinction between museum and heritage sites on the one hand, and theme parks on the other, is gradually evaporating.
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