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FSRS, retention, and why we keep an A-factor beside the card rather than inside the model.

100.0%

Struggling0

Hard or worse, or still unstable.

None right now.

Known5

Recall holding across 90 days.

  • A-factor
  • FSRS
  • note
  • retrievability
  • virtual clock

Untouched0

Tagged, never reviewed.

None right now.

Keep the daily queue moving.

90-day trend from Tiger review_daily

Or drop PDF, Markdown (.md), or text (.txt) files anywhere on this page.

Sources1

Preview of FSRS without an A-factor
FSRS without an A-factor
pdf · unpdf · 381 words

Notes11

Preview of Untitled note
Untitled note
human · updated 9/20/2026
Preview of SpacedRep
SpacedRep
human · updated 9/20/2026
Preview of Active recall drives study efficiency
Active recall drives study efficiency
ai_drafted · updated 9/20/2026
Preview of Overrides multiply the interval
Overrides multiply the interval
ai_drafted · updated 9/20/2026
Preview of Adjust request retention to increase review frequency
Adjust request retention to increase review frequency
ai_drafted · updated 9/20/2026
Preview of FSRS tracks stability and difficulty
FSRS tracks stability and difficulty
ai_drafted · updated 9/20/2026
Preview of The product is the edit
The product is the edit
human · updated 9/20/2026
Preview of FSRS has no A-factor
FSRS has no A-factor
ai_edited · updated 9/20/2026
Preview of Override after the model
Override after the model
human · updated 8/14/2026
Preview of Retention is the honest knob
Retention is the honest knob
ai_drafted · updated 8/16/2026
Preview of Compress the day, not the interval
Compress the day, not the interval
ai_edited · updated 8/18/2026

Extracts4

Preview of FSRS estimates retrievability from a memory model, not from an ease factor you t
FSRS estimates retrievability from a memory model, not from an ease factor you t
priority 10 · anchored · nemotron
Preview of The A-factor in SuperMemo is a per-item multiplier on the next interval. FSRS ha
The A-factor in SuperMemo is a per-item multiplier on the next interval. FSRS ha
priority 15 · anchored · human
Preview of If you compress wall-clock time without compressing the unit of a day, FSRS conc
If you compress wall-clock time without compressing the unit of a day, FSRS conc
priority 20 · anchored · nemotron
Preview of Raising request_retention from 0.90 to 0.95 is the principled way to see cards m
Raising request_retention from 0.90 to 0.95 is the principled way to see cards m
priority 18 · anchored · nemotron

Activities14

Preview of Which SuperMemo idea does FSRS refuse to put inside the model?
Which SuperMemo idea does FSRS refuse to put inside the model?
mcq
Preview of Where should an A-factor be applied?
Where should an A-factor be applied?
mcq
Preview of Raising request_retention from 0.90 to 0.95 will:
Raising request_retention from 0.90 to 0.95 will:
mcq
Preview of Why is multiplying intervals down a bad demo trick?
Why is multiplying intervals down a bad demo trick?
mcq
Preview of Which variables does FSRS track per card?
Which variables does FSRS track per card?
select_all
Preview of A legitimate scheduler override should:
A legitimate scheduler override should:
select_all
Preview of FSRS schedules the next due date so that {{1}} at that date matches the {{2}} you asked for.
FSRS schedules the next due date so that {{1}} at that date matches the {{2}} you asked for.
fill_blank
Preview of Store an A-factor beside the card and apply it {{1}} FSRS speaks.
Store an A-factor beside the card and apply it {{1}} FSRS speaks.
fill_blank
Preview of Raising request_retention from 0.90 to {{1}} shortens every interval.
Raising request_retention from 0.90 to {{1}} shortens every interval.
fill_blank
Preview of Demo mode should redefine the unit of a {{1}} symmetrically, not shrink intervals in wall-clock time.
Demo mode should redefine the unit of a {{1}} symmetrically, not shrink intervals in wall-clock time.
fill_blank
Preview of Name the two latent variables FSRS tracks per card.
Name the two latent variables FSRS tracks per card.
closed
Preview of In one sentence, what should demo mode change instead of shrinking intervals?
In one sentence, what should demo mode change instead of shrinking intervals?
closed
Preview of A correct virtual clock must:
A correct virtual clock must:
select_all
Preview of What does FSRS estimate retrievability from?
What does FSRS estimate retrievability from?
mcq