An association measurement between two variables X and Y may be dramatically changed from positive to negative by omitting a third variable Z, which is called Simpson paradox or Yule-Simpson paradox.

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Simpson Paradox

  • Zhi Geng

摘要

An association measurement between two variables X and Y may be dramatically changed from positive to negative by omitting a third variable Z, which is called Simpson paradox or Yule-Simpson paradox.