What Sharks Can Teach Us About Survivorship Bias
Farnam Street (Shane Parrish) · 2020
"Our fear of great white sharks — and our comparative indifference to more dangerous species like the oceanic whitetip — is itself a case of survivorship bias: we only hear stories from people who survived an attack and lived to describe it, which skews our sense of what's actually dangerous."
Great white sharks are the most feared shark species largely because of pop-culture reinforcement (Jaws) and because they generate the most survivor stories — they attack near shorelines where victims are more likely to be rescued. Oceanic whitetip sharks, which live in the open ocean far from help, are argued to be more dangerous per encounter, but generate far fewer survivor stories simply because fewer people encounter them and live to describe it.
The mechanism is that our estimate of danger is built almost entirely from stories that reach us, and stories can only reach us from survivors — so any domain where non-survival is more likely near where documentation is sparse (open ocean vs. crowded beaches) will be systematically underrated as dangerous, regardless of its true fatality rate, because the silence of the dead carries no data.
Why does this piece argue oceanic whitetip sharks may be more dangerous than their attack statistics suggest?
Read more about the topic
The explanation above is written with AI assistance. These are the originals — go to them to check it.
- Survivorship Bias: The Tale of Forgotten FailuresFarnam Street
- Sharks and Survivorship BiasFarnam Street
Survivorship Bias: The Tale of Forgotten Failures
"We systematically overestimate the odds of success because we only see and study the survivors (the Bill Gateses, the Beatles) while the vastly larger number of people who tried the same thing and failed disappear from view entirely — distorting our sense of cause and effect."