Comment on Five Nurses who work on the same floor at hospital have brain tumorsparentComments−OutOfHere1yRandomness can be clumpy, but clumpiness does not have to be random. Clumpiness is typically causal. Your experiment won't tell you what you need to know.
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Randomness can be clumpy, but clumpiness does not have to be random. Clumpiness is typically causal. Your experiment won't tell you what you need to know.