survivorship bias
C1CEFR level
65/100Rarity: rare
TechnicalRegister
The error of drawing conclusions only from cases that made it through a process while ignoring those that dropped out.
Studying only retained accounts is survivorship bias; the churned ones hold the real lesson.
Rarity runs from 0 (a word everyone knows) to 100 (almost never seen outside specialist or literary writing). Level is the word's real difficulty on the CEFR scale, from A1 to C2.
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