Home/ Questions/Q 6226087
In Process

The Archive Base Latest Questions

Editorial Team
  • 0
Asked: 2026-05-24T08:57:42+00:00

I am implementing a flashcard game and I want to implement spaced repetition. I

  • 0

I am implementing a flashcard game and I want to implement spaced repetition. I don’t need something complex like in SuperMemo, but simply space the learning based on the score for each card.

What I am looking for at the moment is how to calculate the number of days until a card is shown again, based on its score. I found that ZDT uses the list in the screenshot below (1, 2, 3, 5, etc.). Does anybody know how to dynamically generate this list (so that I can calculate beyond a score of 12)?

Or perhaps could someone guess what math function I could use to generate the numbers on the ZDT list? They increase exponentially.

enter image description here

Share

Leave an answer

You must login to add an answer.

Need An Account,

1 Answer

  1. Editorial Team

    It looks very similar to a logistic curve. I’ll run a logistic regression on it and see what comes out.

    Here is the data (plotted using WolframAlpha)

    Data

    Here is the equation I got:

    f(x) = 115/(1+2192*EXP(-0.79*x))

    Here is the plot with the curve:

    Data with curve

    Unfortunately the curve isn’t very accurate for small numbers.

    • 0