recency
B1CEFR level
40/100Rarity: uncommon
TechnicalRegister
How recently a customer last made a purchase, a key predictor of future behaviour.
Scoring on recency, frequency and value, the team prioritised outreach to the freshest lapsers.
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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