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That basically seems to ignore the exponential Ebbinghausian forgetting curve. I doubt it results in better scheduling of the cards.
by hacker42 10y ago
That basically seems to ignore the exponential Ebbinghausian forgetting curve. I doubt it results in better scheduling of the cards.
- mikekchar 10y agoIt's not exponential. It has a gamma distribution. The nice thing about the gamma distribution is that within a short part of the tail it is nearly linear. So while it's hard to explain the math in an HN posting, below a certain probability your odds of getting a 90-95% confidence of a 90% recall rate (10% forgetting) rate is very, very low. So you will have to review all of those cards anyway. Once you get into the range where false positives are more likely (say above 80%) the curve starts to get more linear. This is especially true for cards with a very shallow curve (those that you have seen many times). So even when you get it wrong, the ones that are likely to be problematic are those that you will review again quickly anyway. As for whether it results in a better scheduling of cards, it's hard to say. It has the advantage of being self adjusting and containing far fewer magic numbers than something like SM(insert-any-version-here).