A concept · Reality Deceives · Biases
Survivorship Bias
We study the winners and never see the silent losses.
A founder on stage tells us to drop out, bet everything and ignore the doubters. It worked for them, and the room takes notes. Nobody in the room can hear from the thousands who did the same and quietly went under, because they are not on stages. We copy the visible pattern and expect the visible result. What if the pattern was common and the result was rare?
What Survivorship Bias means
Survivorship bias is the error of drawing lessons only from the cases that made it through, while the failures that would change the lesson never reach us. We study the winners and never see the silent losses. Knowing that takes a sentence. Owning it changes what we do with a success story. We start asking, before we admire any track record, who else started and where they went. We stop treating "they all did X" as proof that X works, because the ones who did X and vanished are not in the count. Before, a list of ten centenarians who smoked felt like evidence. After, we want to know how many smokers there were to begin with, and the list turns back into an anecdote.
Not to be confused with
Survivorship bias is one kind of selection bias, not the whole of it. Selection bias is any way the sample fails to match the population. Survivorship bias is the specific case where what we can see is what survived.
Survivorship Bias examples: where it shows up
- At work: the habits of the star performer get copied across the team, with no way to see how many people with the same habits were let go.
- With money: a fund's ten-year average looks strong partly because the funds that closed along the way were dropped from the table.
- In the news: every profile of a self-made billionaire teaches the moves, and none of them can count the people who made the same moves.
Where it sits
Concept 2 of 5 in Reality Deceives, a journey in the course The Examined Mind.
See where Survivorship Bias sits on the sky →
Nearest on the sky
A filled dot marks a star that is already open to walk.
Knowing it isn't owning it.
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