heteroscedasticity
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
The condition in which the variability of a model's errors is unequal across the range of a predictor, violating a core regression assumption.
The residual plot fans out badly, so heteroscedasticity is inflating our intervals and we should switch to robust standard errors.
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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