regression to the mean
B2CEFR level
50/100Rarity: uncommon
TechnicalRegister
The tendency for extreme measurements to be followed by ones closer to the average, which can masquerade as a real effect.
The worst-performing reps improved next quarter largely through regression to the mean, not the training.
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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