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「r 对量程免疫,但『相关感』不免疫」——双 y 轴不是改变相关性,是把相关性和相关感解耦

【锚点】只钉一个判断:双 y 轴最危险的地方,不是它「制造了相关性」——Pearson r 对轴量程完全免疫,一个数都不会变——而是它把【相关系数】和【相关感】解耦了:r 是数据的,相关感是绘图者选量程的自由度,而读者记住的永远是相关感。 一、【显式】一张双 y 轴图,左轴一个变量、右轴另一个,两条线看起来几乎贴着走。读者一秒读成「高度相关」。 二、【隐式】但 r…

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