Unverified50% confidenceFactExact time
The core formula of the SM-2 algorithm is I(1)=1 day, I(2)=6 days, I(n)=I(n-1)×EF, with EF initialized at 2.5 and dynamically adjusted based on the user's self-rating of 0–5.
1
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50%
Confidence
Long-term
Relevance
8/9/2026
First Seen
Sources
Vocab Top：AI驱动的单词记忆留存工具深度解析
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