Psychology
What is Survivorship bias?
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.
See it, don’t just read it.
Watch a 2-minute lesson with voice + animation that explains survivorship bias.
Key things to understand
- 1We focus on survivors and ignore the failures.
- 2It hides the full picture and skews conclusions.
- 3Famous example: reinforcing returning warplanes' bullet holes.
- 4It leads to overestimating odds of success.
Frequently asked questions
- 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.