2009/2/18 CanadianGuyEnFrance <[email protected]>: > I have noticed that a card interval will increase when I select a > grade of 2. This seemed a bit surprizing given that the grade 2 > selection indicates: > > "Barely correct answer. The interval was way too long" > > I expected the interval to decrease after this selection. > > for example, when a particular card showed Days since last > repetition=94, > then, I selected 2, and then looked up the card in the deck, > Day until next repetition>94 (I can't recall the exact number). > > Is this behaviour correct?
Hi, This is a common misunderstanding. Since you select answers 2, 3 or 4 when you answered the card _correctly_, then the interval is increased for the next time. This is the basis of a spaced repetition system. It's just increased by a smaller factor than if you'd answered 3 or 4 (but the factor is still greater than 1). A rough guide to what Mnemosyne or another SRS does could be: 0/1 -> Wrong, move the card to the forgotten/unlearned pile 2 -> Correct, but it was too difficult so don't schedule it as long as 3 or 4 - set the next interval to some constant i (> 1) multiplied by the current interval 3 -> Just right - set the next interval to some constant j (> i) multiplied by the current interval 4 -> Too easy - set the next interval to some constant k (> j) multiplied by the current interval Making the interval for a card you answered 2 shorter than it was this time around is redundant, because we already know that we can successfully answer the card after that interval. Oisín --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "mnemosyne-proj-users" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/mnemosyne-proj-users?hl=en -~----------~----~----~----~------~----~------~--~---
