Question 1

What is the difference between Survivorship bias and Selection bias?

Accepted Answer

Survivorship bias is a subtype of selection bias — the specific case where the filter is survival or success. All survivorship bias is selection bias; not all selection bias involves anything surviving.

Question 2

How do I know if I mean Survivorship Bias rather than Selection bias?

Accepted Answer

Readers who land here meaning Survivorship Bias rather than Selection bias are usually searching for phrases like “why does success advice not work”, “survivorship bias explained”, “the planes that didn't come back”.

Aspect	Survivorship bias	Selection bias
Filter	Survival	Any
Scope	Narrow	Broad
Classic case	Wald's aircraft	Any unrepresentative sample
Relationship	A subtype	The category

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Survivorship Bias

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