xkcd bad data mining: only green jelly beans cause acne

Data Mining 101: a great example of what not to do by xkcd creator Randall Munroe

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Randall Munroe, the creator of xkcd webcomic, has a great illustration of bad data mining in this comic (named significant).

This should be required study in every Data Mining 101 class - as introduction to common errors due to multiple comparisons or multiple testing .