by Ernie » Sun Mar 17, 2019 8:21 am
Hi Vinde,
I think Anki's formulas are based off of Supermemo's, which are very complex. I didn't want to go down that route because I wanted something that people can relatively easily understand and tweak. I came up with my default intervals based on what I saw others doing (including Supermemo) and added some conservativeness to it. From my readings back then, I was, and still am, under the impression that little differences in calculations across apps do not affect results much. One goal of SR is to show the card again just as you about to forget it. Supermemo, I think, will dynamically change next intervals to target say a 90% correct rate. I don't have anything auto-adjusting interval calcs like that, but you can view "Correct % by Interval (SR)" in the Stats screen to get a sense of where you are at.
If you feel you are getting tested too often, increase interval factors, increase initial interval, swipe up more often, etc. I use the default factors myself, but I forget things easily, so others may find them a bit too conservative. I change Wrong Interval Factor to 0.7 though so wrong answers aren't so detrimental. I set "new to active after" to "1 correct", so I can manually control when I want each card to become active. I added a new "Postpone / Next Review" "study button" to the app which you can add to the bottom of the study screen to make it a little easier to make overrides to default behavior.
I have an "Early correct factor" because I feel intervals should rise more quickly (factor-wise) at the beginning. Strong is for swipe up, so if you know it well, delay it longer.
I don't really have much of a conversation available as to what is the best, other than what I wrote above. Personally, I'd wouldn't worry too much about it and just go with what feels right after using the app a while. As you get more cards in your deck, it's possible that you're going to start getting overwhelmed with due cards. At this point, you'll start to think more about how to get intervals up more quickly (using options I mentioned above), but you of course don't want to get them up too quickly that you are forgetting a lot. Since each person is different and each subject as different in difficulty, I doubt there something that is "best". This is maybe where the "dynamic interval calc" that I mentioned above might be nice (that would auto raise/lower factors depending on how you are doing), but again, I didn't want the complications of something like that, both for me and the user.
Hi Vinde,
I think Anki's formulas are based off of Supermemo's, which are very complex. I didn't want to go down that route because I wanted something that people can relatively easily understand and tweak. I came up with my default intervals based on what I saw others doing (including Supermemo) and added some conservativeness to it. From my readings back then, I was, and still am, under the impression that little differences in calculations across apps do not affect results much. One goal of SR is to show the card again just as you about to forget it. Supermemo, I think, will dynamically change next intervals to target say a 90% correct rate. I don't have anything auto-adjusting interval calcs like that, but you can view "Correct % by Interval (SR)" in the Stats screen to get a sense of where you are at.
If you feel you are getting tested too often, increase interval factors, increase initial interval, swipe up more often, etc. I use the default factors myself, but I forget things easily, so others may find them a bit too conservative. I change Wrong Interval Factor to 0.7 though so wrong answers aren't so detrimental. I set "new to active after" to "1 correct", so I can manually control when I want each card to become active. I added a new "Postpone / Next Review" "study button" to the app which you can add to the bottom of the study screen to make it a little easier to make overrides to default behavior.
I have an "Early correct factor" because I feel intervals should rise more quickly (factor-wise) at the beginning. Strong is for swipe up, so if you know it well, delay it longer.
I don't really have much of a conversation available as to what is the best, other than what I wrote above. Personally, I'd wouldn't worry too much about it and just go with what feels right after using the app a while. As you get more cards in your deck, it's possible that you're going to start getting overwhelmed with due cards. At this point, you'll start to think more about how to get intervals up more quickly (using options I mentioned above), but you of course don't want to get them up too quickly that you are forgetting a lot. Since each person is different and each subject as different in difficulty, I doubt there something that is "best". This is maybe where the "dynamic interval calc" that I mentioned above might be nice (that would auto raise/lower factors depending on how you are doing), but again, I didn't want the complications of something like that, both for me and the user.