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Simpson's Paradox
Monday, August 2, 2004

One nice thing about attending academic workshops is that you meet lots of smart people and learn new things. Today someone mentioned Simpson's paradox (really just a conundrum). Simpson's paradox occurs when group A scores better than group B on every separate trial yet group B scores higher when all of the trials are combined. Though surprising it's really just a matter of not being able to add rates (because they are fractions with differing denominators!). The web site I linked to has several other good examples. It's worth looking at.


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