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What is survivorship bias?

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Quick answer

Survivorship bias is the mistake of focusing only on the things that 'survived' a process while ignoring those that didn't. By studying only successes — like famous dropouts who got rich — we draw false conclusions, missing the many failures we never see.

Key things to understand

  1. We focus on survivors and ignore the failures.
  2. It hides the full picture and skews conclusions.
  3. Famous example: reinforcing returning warplanes' bullet holes.
  4. It leads to overestimating odds of success.

People also ask

What is survivorship bias?
Drawing conclusions from only the successes that 'survived', while ignoring the failures you can't see.
What's a classic survivorship bias example?
Plotting bullet holes only on planes that returned, missing where the downed planes were actually hit.
Why is survivorship bias dangerous?
It makes success look more likely and its causes clearer than they really are, hiding the failures.