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Contents : Technical reference : Statistics
Statistics window

The Statistics window can most conveniently be viewed by pressing F5 (Window : Layout : Warrior layout). This arranges the statistics and element parameters windows in the classic way first introduced in SuperMemo 3.0 in 1988. 

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:

The caption of the statistics window displays the name of the collection in square brackets.

Learning parameters displayed in the statistics window:

Comments:

  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), Remember Cloze, 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, Measured FI, 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

FAQ

In SuperMemo, Memorized<>Remembered
Retention statistic assumes regular repetitions and well-structured learning material


In SuperMemo, Memorized<>Remembered
(jj, UK, Sunday, December 24, 2000 1:54 AM)

Question:
I have noticed in the Statistics that the number of elements memorized increases even when I enter Fail when answering incorrectly. For instance, in the collection of US States Capitals, it was showing 100% memorized when I was still getting many of them wrong
Answer:
Parameter Memorized indicates the number of elements in the learning process; not the number of elements you are able to recall correctly. If you make regular repetitions in the long run (i.e. over weeks and months), the number of elements you will be able to recall will approximately equal Memorized*Retention


Retention statistic assumes regular repetitions and well-structured learning material
(dansujp, Sun, Sep 16, 2001 3:07 PM)
Question:
When I returned from vacation, I expected the retention to be something like 80% because I have not done any repetitions for two weeks. But it was exactly the same as before I left
Answer:
The Retention statistic is derived directly from the measured forgetting index on the assumption of a negatively exponential forgetting curve. This curve is only representative of well-structured learning material. In addition, the forgetting index measurements are averaged over all recorded cases. A break in repetitions will invalidate the statistic. Resuming repetitions is not a guarantee of accuracy as the large number of earlier repetitions will result in overestimating the retention on a small-sample measurement. The only valid estimation of retention after a break in learning is the one that follows resetting the past forgetting index record (File : Tools : Reset parameters : Forgetting index record). This will result in gathering new data that will approach true retention for the sample tested with accuracy proportional to the number of repetitions done