Statistics window

The Statistics window can most conveniently be viewed by pressing F5 (Window : Layout : Warrior layout).

The picture below shows an exemplary Statistics window. The description of individual fields is presented below the picture. Click the picture now to open it in a separate window for easy comparison of fields and their descriptions:

SuperMemo: Statistics window that you can use to inspect the main learning parameters of your learning process

The caption of the statistics window displays the name of the collection in square brackets. The presented collection is named All.

Learning parameters displayed in the statistics window:

  1. every user will experience delays in repetitions from time to time (e.g. as a result of using Postpone),
  2. low-priority material in the overloaded incremental reading process is scheduled in intervals longer than optimum intervals, and
  3. SuperMemo imposes some constraints on the length of intervals that, in some cases, make it schedule repetitions later than it would be implied by the forgetting index. The constraints in computing intervals, for example, prevent the new interval from being shorter than the old interval (assuming the item has not been forgotten). For low values of the forgetting index and items with a low A-Factor, the new optimum interval might often be shorter than the old one! Measured FI can be reset with Tools : Statistics : Reset parameters : Forgetting index record.
In the presented example, an average of 14.62% of item repetitions end with a grade less than Pass (3) (since the measured forgetting index record has last been reset). On Nov 17, 2013, 6.8% of repetitions ended in failure thus far (i.e. with a grade less than Pass)..


  1. Items are added to the final drill not only during standard repetitions when you grade an element below Good (4). Operations such as Remember (Ctrl+M), Cloze (Alt+Z), and Add to drill (Shift+Ctrl+D) will also add to the final drill queue. The final drill queue is created automatically only if you uncheck Tools : Options : Learning : Skip final drill
  2. Some fields of the Statistics window can be edited. For example: Alarm, Total time, Rep count, etc. To edit and entry, click it, type the new value and press Enter. If the entry cannot be modified SuperMemo will warn you (e.g. "Retention entry cannot be modified").
  3. See Survey 1994 and Survey 1999 for some interesting notes about the speed of learning reached with SuperMemo