selection bias
B2CEFR level
55/100Rarity: uncommon
TechnicalRegister
Distortion in results caused by the way subjects are chosen, so the sample is not representative of the population.
Surveying only power users introduces selection bias and overstates satisfaction.
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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