Anki Analytics: Card difficulty

In a follow up on my post on leeches, I graphed the amount of reps it took to get each card to an interval of 90 days.  Again, the chart for kanji is the odd man out with it’s plot being more linear than the others, suggesting that different types of memories behave differently.  But even with kanji, we see that the most difficult cards take many multiples the number of repetitions that the median card takes.

By my calculations, the easiest 80% of my core vocabulary cards takes roughly the same number of reps as the hardest 20%.  In other words, I could learn 4 easy cards in the same time it takes to learn 1 of the harder cards.  It sure would be nice to identify those difficult cards early somehow.

low high mean median
Tae Kim 5 20 8.386740331 8
RTK 3 98 37.78409091 34.5
Core sentences 2 59 9.30834753 7
Core vocab 2 194 30.17112299 19
JFBP 5 164 19.59797297 7

rtk_ivl90 tk_ivl90 jfbp_ivl90 corevocab_ivl90 coresentence_ivl90

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