Portal:Mathematics/Featured picture/2014 02
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Picture of the month
![](http://upload.wikimedia.org/wikipedia/commons/thumb/4/47/Simpson%27s_paradox_continuous.svg/360px-Simpson%27s_paradox_continuous.svg.png)
Credit: Schutz
Simpson's paradox for continuous data: a positive trend appears for two separate groups (blue and red), a negative trend (black, dashed) appears when the data are combined.
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