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规则的有效性说法有误 #1

@taoqiongxing

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@taoqiongxing

Lift(X→Y) <=1 的 X→Y 是有效的强关联规则——### 无效
“茶叶→咖啡”的支持度:Support(X→Y) = 450 / 1000 = 45%——### Support(X→Y) = 450 / 500 = 90%

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