What is the spaced repetition algorithm to generate the day intervals?

Question

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

Answer 1

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)

Here is the equation I got:

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

Here is the plot with the curve:

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