Anki statistics explained

This seems to be a bit difficult to interpret, right? Let’s see what these charts mean.

Anki is a free and open-source flashcard program that utilizes spaced repetition (an evidence-based learning technique that is usually performed with flashcards, where newly introduced and more difficult flashcards are displayed more frequently, while older and less difficult cards are displayed less often to exploit the effect of psychological distance). Anki (暗記) is the Japanese word for memorization.

Besides flashcards, Anki also offers a series of statistics, meant to show you how well you manage to learn. The only problem is that these statistics are difficult to interpret, and many users simply do not understand what those charts represent. Let’s begin.

1. Forecast

The Forecast chart should look like the one above. The graph shows an estimated number of reviews that will be due on a given day in the future if you don’t learn new cards and fail cards. The bars and the left axis shows the number of cards due on each day if you study all the cards each day, while the line and the right axis shows the number of cards due on that day if you don’t study at all until then. Dark green portions of bars are ‘mature’ cards, meaning cards that will appear after 21+ days, and the green ones are those that appear after under 21 days. Under the chart you can see the total of the cards that you will have to review in the next X days (in my case, 65), the average per day (the total number of cards divided by the number of days) and how many cards you will have to review tomorrow.

2. Review Count

This chart shows you the situation of the Reviews of the last 30 days. The Dark green portions of bars are the ‘mature’ flashcards that you learned on that specific day, the light green ones are the ‘young’ flashcards (I explained earlier what mature and young cards mean), the blue ones are the newly learned, and the orange ones are the relearned ones (repeated 2 or more times in the same day, because you clicked ‘Again’). ‘Days studied’ means the number of days studied in the last 30 days divided by 30 days (or the number of days since you installed Anki, if you installed it for less than 30 days). ‘Total’ is the sum of the number of reviews from the last month, and ‘Average for days studied’ is the total divided by the number of days. ‘If you studied every day’ is a little self-explanatory, and for me (and for many, I hope) it acts as a sign that you’re kind of lazy.

3. Review Time

This chart is similar to the Review Count. ‘Total’: the number of hours you spent on Anki in the last month. ‘Average for days studied’, that number of hours divided by 30 days, and ‘If you studied every day’, well… you probably figured it out yourself. ‘Average answer time’, well, here we come to an interesting thing. The number of cards learned/reviewed in a month is divided by the time spent on Anki in the last 30 days (measured in hours and minutes).

4. Added

The number of new cards you have added and the daily average. Although I posted above a screenshot with my ‘Added’ chart, don’t take it into account. My deck doesn’t contain flashcards added by me, but imported from ankiweb.net.

5. Intervals

The average number of days the flashcards will be reviewed, and the largest interval after which a flashcard will be reviewed.

6. Hourly Breakdown

A very interesting chart, perhaps the most interesting of all these charts. It shows you your performance according to the time you used Anki. The left axis shows the percentage of correct reviews, the right axis shows the number of reviews made. On the horizontal you can see the breakdown of performance according to hours, usually you are given as a reference point 10AM, 4PM and 10PM. The gray background of the bar shows the percentage of correct reviews (look at the left axis to see the percentage reference), while the gray part of the bar shows the number of correct answers (see the right axis).

7. Answer Buttons

Another very important chart. The percentage of the total number of clicks is represented by the number of clicks on a certain button (1, 2 or 3, ie Hard, Good, Easy). On the left axis you can see the number of answers depending on the button pressed.

8. Card Types

Number of Mature, Young or Unseen cards. Simple and intuitive.

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