Repetition history: Difference between revisions

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== Repetition history window  ==
== Repetition history window  ==


With '''Learning : Show repetition history''' (''Shift+Ctrl+H'') available from the [[element menu]] you can quickly display the history of repetitions for the currently displayed element. Alternatively, double-click the [[Element data window]] to open the repetition history of the element.  
With '''[[Element menu#Learning|Learning]] : Statistics : Repetition history''' (''Shift+Ctrl+H'') available from the [[element menu]], you can quickly display the history of repetitions for the currently displayed [[Glossary:Element|element]].
<div class="center">
 
[[Image:Repetition history2.jpg|719px|The exemplary repetition history of an item that has been forgotten at least once in the course of its repetitions]]  
[[Image:Repetition history.jpg|center|600px|SuperMemo: Repetition history dialog box displaying the history of repetitions for the current element]]
<blockquote>''The exemplary repetition history of an item that has been forgotten once (at the 2nd repetition).''</blockquote></div>
{{:Image:Repetition history.jpg}}


== Columns in the Repetition history table ==
== Data columns ==


*'''No''' - the number of times the element was repeated. ''(f)'' to the left of any given repetition number indicates the repetition&nbsp;when the&nbsp;item was&nbsp;'''f'''orgotten (i.e. you were not able to provide the correct answer) the element at. ''In the example above, the item was not recalled at the 2nd repetition''.  
*'''No''' - the number of times the [[Glossary:Element|element]] was repeated/reviewed. ''(f)'' to the left of any given repetition number indicates the repetition when the [[Glossary:Item|item]] was '''f'''orgotten (i.e. you were not able to provide the correct answer). ''In the example above, the item was not recalled at the 2nd repetition''.  
*'''Rep''' - the first figure represents the number of consecutive successful repetitions (when you graded yourself '''Pass (3)''' or higher). The other one shows the cumulative number of times you did not remember the element (i.e. your grade was '''Fail (2)''' or less) since you first memorized it. Note that each time you forget the answer, the first figure gets reset to 1.  
*'''Rep''' - the first figure represents the number of consecutive successful repetitions (when you graded yourself '''Pass (3)''' or higher). The other one shows the cumulative number of times you did not remember the [[Glossary:Item|Item]] (i.e. your grade was '''Fail (2)''' or less) since you first memorized it. Note that each time you forget the answer, the first figure gets reset to 1.  
*'''Date''' - the date when you repeated the element, or, when it is scheduled for the next repetition ('''Next''' at the top)
*'''Date''' - the date when you repeated/reviewed the [[Glossary:Element|element]], or, when it is scheduled for the next repetition ('''Next''' at the top)
*'''Hour''' - the time (hh:mm) when you repeated a given element  
*'''Hour''' - the time (hh:mm:ss) when you repeated a given [[Glossary:Element|element]]
*'''Grd''' - the grade that you gave yourself at a given repetition  
*'''Grd''' - the grade that you gave yourself at a given repetition. Since you do not grade yourself on [[Glossary:Topic|topics]], the column reads ''Topic'' for this type of [[Glossary:Element|element]]
*'''Intrv''' - the number of days between successive repetitions:&nbsp;the one from the preceding row and the one from the current row
*'''Interval''' - the number of days between successive repetitions: the one from the preceding row and the one from the current row
*'''Prior''' - the relative position of the element in the priority queue at the time of the repetition (the lower the number, the higher the priority)
*'''Prior''' - the relative position of the [[Glossary:Element|element]] in the [[Glossary:Priority_queue|priority queue]] at the time of the repetition (the lower the number, the higher the [[Glossary:Priority|priority]])
*'''AF''' - element's [[Glossary:A-Factor|A-Factor]] after a given repetition  
*'''Difficulty''' - [[Glossary:Element|element]]'s [[Glossary:Difficulty|difficulty]] after a given repetition  
*'''UF''' - element's [[Glossary:U-Factor|U-Factor]] after a given repetition  
*'''S''' - [[Glossary:Element|element]]'s [[Glossary:Stability|stability]] after a given repetition
*'''eFI''' - element's expected probability of forgetting at a given repetition. ''In the picture above, the 94% probability of forgetting the item at the 2nd repetition was related to the fact that it was scheduled for repetition only after 33 days since it was first memorized. Expectedly, the student did not remember the item at that time (as indicated by (f) in the '''No''' column). The reason behind the unusual over a month long interval between the 1st and 2nd repetition was that student decided to re-memorize the collection when he had resumed the repetitions after a long break and was well-acquainted with a significant portion of the material available in it. By grading himself '''Bright''' and '''Good''' on newly re-memorized items, he led SuperMemo to believe that the material he was dealing with was relatively easy. As a result, SuperMemo extended the average length of the first interval for the newly memorized items. It was all good and expected until he got to the other part of the collection that he had never memorized before. At that time, long first intervals started to have an adverse effect on his retention. Therefore, it is always recommended that you do not re-memorize the material that you have once learned with SuperMemo but rather use tools available in SuperMemo (e.g. [[Postpone]]) to help you recover from breaks in regular learning with the program.''
*'''R est. vs. R''' - [[Glossary:Retrievability|retrievability]] as computed with the [[Glossary:DSR_model|DSR model]] ([https://supermemo.guru/wiki/Algorithm_SM-17 Algorithm SM-17]), and retrievability derived from the [https://supermemo.guru/wiki/Forgetting_index_in_SuperMemo#expected_forgetting_index expected forgetting index] ([https://supermemo.guru/wiki/Algorithm_SM-15 Algorithm SM-15]). Darker fields show higher predictive differences
*'''Dev''' - retrievability deviation: the disparity between [[Glossary:Retrievability|retrievability]] and actual recall expressed with the default metric (as percent)
*'''Postp.''' - the number of times the [[Glossary:Element|element]] was postponed until a given repetition


== Repetition history context menu  ==
== Context menu  ==


Right-click over the repetition history window opens a context menu with the following items:  
Right-click over the '''Repetition history''' window opens a context menu with the following [[Glossary:Item|item]]s:  


*'''Close''' (''Esc'') - close the repetition history window
*'''Edit''' (''Ctrl+E'') - edit the repetition history (this may affect the algorithm and sleep optimization)
*'''Copy''' (''Ctrl+C'') - copy the element's repetition history to the clipboard  
*'''Copy''' (''Ctrl+C'') - copy the [[Glossary:Element|element]]'s repetition history to the clipboard  
*'''Delete''' (''Del'') - delete the element's repetition history (after confirmation)
*'''Delete''' (''Del'') - delete the element's repetition history (after confirmation)
*'''Save''' (''Ctrl+S'') - save the repetition history if it has been corrected for errors
*'''Close''' (''Esc'') - close the repetition history window
*'''Memory status''' (''F2'') - visualize changes in memory [[Glossary:Retrievability|retrievability]] and [[Glossary:Stability|stability]] over time
*'''Fix and Edit''' - correct errors in repetition history before editing. The [https://supermemo.guru/wiki/SuperMemo_Algorithms latest algorithm]s put a premium on the correctness of repetition histories. Some data errors inherited from older SuperMemos would be uncovered in SuperMemo 17 or later (e.g. in multiple dismiss/reset operations, postpones, fake date settings, etc.). Raw repetition history data can be edited, however, it may be more convenient to do basic error correction by SuperMemo before the editing. '''Fix and Edit''' does error recovery and only then presents data for editing
<div class="center">
[[File:Memory status.jpg|800px|SuperMemo: Changes in two components of long-term memory]]
{{:File:Memory status.jpg}}
</div>
== Editing repetition history ==


== Example  ==
Due to the fact that [[SuperMemo Algorithm]] relies heavily on repetition history, you should only edit repetition history in emergencies (e.g. issuing a wrong grade, reviewing on a wrong date, data errors, completing missing records, etc.).


''... missing data ... ''in this example is a result of the fact that the repetition history was collected in SuperMemo only as of 1996, while the presented collection is much older (with 6 repetitions executed before or in 1996). Also, the hour data is missing in older repetitions due to the fact that the repetition hour is registered in repetition history only as of SuperMemo 2006 (hours are used in correlating retention with sleep data available from '''[[SleepChart]]''').  
You can edit repetition history by pressing ''Ctrl+E'' in the repetition history window. If you introduce discrepancies between the repetition history and the current [[element data]], choose '''Repetition history data''' when answering '''Which repetition history data is more accurate?'''.


[[Image:Repetition history.jpg|center|800px|SuperMemo: Repetition history dialog box displaying the history of repetitions for the current element]]
== FAQs ==
* [https://supermemopedia.com/wiki/Edit_repetition_history How to undo a '''Dismiss''']
* [https://supermemopedia.com/wiki/Interpretation_of_grades_Auto_and_N/A_in_Repetition_History_Dialog_Box Grades Auto and N/A]

Revision as of 17:54, 23 October 2019

Repetition history window

With Learning : Statistics : Repetition history (Shift+Ctrl+H) available from the element menu, you can quickly display the history of repetitions for the currently displayed element.

SuperMemo: Repetition history dialog box displaying the history of repetitions for the current element

Figure: Repetition history dialog box displaying the history of repetitions for the current element related to the Malpighian body and the renal tubules. In this example, the item has been repeated 11 times thus far. It was forgotten only once at the 3rd repetition on Apr 20, 1999 (after 97 days since the previous repetition). Since then it has been recalled successfully every time. It was last repeated on Aug 31, 2023 at 15:48:45. The hour data is present only for the last two repetitions due to the fact that SuperMemo registers the repetition hour only as of SuperMemo 13 onwards (hours are used in correlating retention with sleep data available from SleepChart). The item is scheduled for repetition in roughly 4 years (on Sep 02, 2027)

Data columns

  • No - the number of times the element was repeated/reviewed. (f) to the left of any given repetition number indicates the repetition when the item was forgotten (i.e. you were not able to provide the correct answer). In the example above, the item was not recalled at the 2nd repetition.
  • Rep - the first figure represents the number of consecutive successful repetitions (when you graded yourself Pass (3) or higher). The other one shows the cumulative number of times you did not remember the Item (i.e. your grade was Fail (2) or less) since you first memorized it. Note that each time you forget the answer, the first figure gets reset to 1.
  • Date - the date when you repeated/reviewed the element, or, when it is scheduled for the next repetition (Next at the top)
  • Hour - the time (hh:mm:ss) when you repeated a given element
  • Grd - the grade that you gave yourself at a given repetition. Since you do not grade yourself on topics, the column reads Topic for this type of element
  • Interval - the number of days between successive repetitions: the one from the preceding row and the one from the current row
  • Prior - the relative position of the element in the priority queue at the time of the repetition (the lower the number, the higher the priority)
  • Difficulty - element's difficulty after a given repetition
  • S - element's stability after a given repetition
  • R est. vs. R - retrievability as computed with the DSR model (Algorithm SM-17), and retrievability derived from the expected forgetting index (Algorithm SM-15). Darker fields show higher predictive differences
  • Dev - retrievability deviation: the disparity between retrievability and actual recall expressed with the default metric (as percent)
  • Postp. - the number of times the element was postponed until a given repetition

Context menu

Right-click over the Repetition history window opens a context menu with the following items:

  • Edit (Ctrl+E) - edit the repetition history (this may affect the algorithm and sleep optimization)
  • Copy (Ctrl+C) - copy the element's repetition history to the clipboard
  • Delete (Del) - delete the element's repetition history (after confirmation)
  • Save (Ctrl+S) - save the repetition history if it has been corrected for errors
  • Close (Esc) - close the repetition history window
  • Memory status (F2) - visualize changes in memory retrievability and stability over time
  • Fix and Edit - correct errors in repetition history before editing. The latest algorithms put a premium on the correctness of repetition histories. Some data errors inherited from older SuperMemos would be uncovered in SuperMemo 17 or later (e.g. in multiple dismiss/reset operations, postpones, fake date settings, etc.). Raw repetition history data can be edited, however, it may be more convenient to do basic error correction by SuperMemo before the editing. Fix and Edit does error recovery and only then presents data for editing

SuperMemo: Changes in two components of long-term memory

Figure: Changes in memory status over time for an exemplary item. The horizontal axis represents time spanning the entire repetition history. The top panel shows retrievability (tenth power, R^10, for easier analysis). Retrievability grid in gray is labelled by R=99%, R=98%, etc. The middle panel displays optimum intervals in navy. Repetition dates are marked by blue vertical lines and labelled in aqua. The end of the optimum interval where R crosses 90% line is marked by red vertical lines (only if intervals are longer than optimum intervals). The bottom panel visualizes stability (presented as ln(S)/ln(days) for easier analysis). The graph shows that retrievability drops fast (exponentially) after early repetitions when stability is low, however, it only drops from 100% to 94% in long 10 years after the 7th review. All values are derived from an actual repetition history and the DSR model.

Editing repetition history

Due to the fact that SuperMemo Algorithm relies heavily on repetition history, you should only edit repetition history in emergencies (e.g. issuing a wrong grade, reviewing on a wrong date, data errors, completing missing records, etc.).

You can edit repetition history by pressing Ctrl+E in the repetition history window. If you introduce discrepancies between the repetition history and the current element data, choose Repetition history data when answering Which repetition history data is more accurate?.

FAQs