sample ratio mismatch
C2CEFR level
97/100Rarity: very rare
TechnicalRegister
A discrepancy between the expected and observed split of users across experiment variants, signalling a flaw in the test setup.
A sample ratio mismatch of 55/45 told us the randomisation was broken, so we voided the results.
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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