multicollinearity
C2CEFR level
92/100Rarity: very rare
TechnicalRegister
A situation where predictor variables are so strongly interrelated that their individual effects cannot be reliably disentangled.
Region and store size move together almost perfectly, so multicollinearity makes the coefficients flip sign every time we refit.
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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