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Surusu Stats Definitions

There are three kinds of lies: lies, damned lies, and statistics.

  • Today
    • Repcount: Number of reps you have done today
    • Recall: Percentage of reps where you got a score of 3 or more
    • Deletecount: Number of cards deleted today
    • Addcount: Number of cards added today
    • Duecount: (Approximate) number of cards due today
  • Overall:
    • Cardcount: Total number of cards in deck
    • Repcount: All-time number of reps done across all cards in deck
    • Interval: Length of time (=number of days) between the previous rep and the next scheduled rep for a given card, accumulated across the entire deck and then averaged out.
    • Coverage: The percentage of cards in the deck that have been touched (had reps done on them) at least once
      • Virgin cards: cards on which you have done no reps. These cards do not (cannot) contribute to coverage.
    • Retention: Percentage of reps where you got a score of 3 or more (with the added assumption that virgin cards count as perfect retention, since, in theory (and usually in practice, too), you know the contents of a card when you create/enter it).
    • (Not always visible) Trash bad cards: Selects a stratified sample of relatively mature non-virgin cards with exceedingly poor performance statistics (high lapsecounts and lapserates) and deletes them. Such cards are also known as “leeches”.
    • (Not always visible) Cull virgin cards: Selects a stratified sample of the deck (i.e. a random sample of virgin cards) to send to the trashcan.
      • It is a decimator function, reducing a maximum of 10% of the deck’s overall cardcount while only targeting virgins.
      • Culling is useful for a deck that has become unmanageably overloaded with new cards (of dubious-to-ambivalent value) by auto-insertion/auto-addition technological conveniences such as deck import and multiple cloze deletion card creation. As the saying goes, “if in doubt, throw it out”.
  • Note: unless otherwise stated, non-active (trashed or permanently deleted) cards are excluded from all stats

  3 comments for “Surusu Stats Definitions

  1. Mika
    August 4, 2011 at 23:06

    Thank you for this!! 🙂 It helped a lot! 🙂

  2. September 10, 2011 at 00:44

    Whats SD and CV?

  3. September 10, 2011 at 00:45

    Sorry but whats SD and CV?

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