A/B testing
C1CEFR level
55/100Rarity: uncommon
TechnicalRegister
A method of comparing two versions of an asset to see which performs better.
A/B testing the subject line lifted open rates by nine per cent with no extra spend.
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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