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What is Simpson's paradox?

  1. A A trend present in subgroups reverses when the groups are combined
  2. B Correlation increasing with sample size
  3. C Two models producing identical results
  4. D A distribution with two peaks
Answer

A trend present in subgroups reverses when the groups are combined

It arises from a confounding variable with unequal group sizes, and it is a strong argument for always segmenting before concluding.

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