[Question] Does it take into account delays

[Vilhelm-Ian]

Research

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Question

Does the algorithm factor in delayed reviews. For example if I had a card due on the 10th. And if I answered it correct it would show me in five days. What would happn if I review the card on the 30th would it still show it me in 5 days or will it take into account that I was able to answer it even though there was a large delay.

also can you add an answer to this in the faq

[L-M-Sherlock]

Does the algorithm factor in delayed reviews.

Of course. FSRS take into account delays via the retrievability of card when you review it.

In FSRS, a delay in reviewing (i.e., overdue reviews) affects the next interval as follows:

As the delay increases, retention (R) decreases. If the review was successful, the subsequent stability (S) would be higher, according to point 3 above. However, instead of increasing linearly with the delay like the SM-2/Anki algorithm, the subsequent stability converges to an upper limit, which depends on your FSRS parameters.

For details, please see: https://github.com/open-spaced-repetition/fsrs4anki/wiki/The-Algorithm