Glossary:Difficulty: Difference between revisions

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(Created page with ''''difficulty''' - estimation of element difficulty in '''SuperMemo'''. Two measures can be used to express '''difficulty''': (1) current estimation of '''element'''<nowiki>'</no…')
 
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'''difficulty''' - estimation of element difficulty in '''SuperMemo'''. Two measures can be used to express '''difficulty''': (1) current estimation of '''element'''<nowiki>'</nowiki>s absolute difficulty is represented by [[#A-Factor|'''A-Factor''']] (this measure determines the next '''inter-repetition interval''' for items), and (2) heuristic measure of difficulty based on the history of repetitions and displayed in the [[Element data window|element data]] window as '''Difficulty''' (this measure can be used to sort collections that are to be used by other users; starting with easy items first). An item that is initially difficult (low '''A-Factor''') can become easy to recall once a strong memory imprint is formed. Such an item may quickly reach a relatively high value of '''A-Factor''' that reflects current recall difficulty. On the other hand, the '''Difficulty''' parameter takes into account, apart from '''A-Factor''', such parameters as the number of lapses, current interval, etc. If an item reaches a long interval on poor grades, it will have a low '''A-Factor''' but may have a high '''Difficulty'''. At the same time, an item forgotten many times may suddenly reach a high '''A-Factor''' while its '''Difficulty''' still remains high. '''Difficulty''' is expressed as percentage with 0% standing for easiest possible items, and 100% for the most difficult items. '''A-Factors''' may be considered as the difficulty from the point of view of [http://supermemo.com/english/algsm11.htm SuperMemo Algorithm], while '''Difficulty''' is closer to expressing what the user views as the difficulty of learning a given '''element''' (to see components of '''Difficulty[2]''' press ''Ctrl+Shift+P'' and click '''Difficulty''')
;<span id="Difficulty">difficulty</span>
:estimation of [[Glossary:Item|item]]'s difficulty in [[Glossary:SuperMemo|SuperMemo]]. The three main measures of '''difficulty''':
:# current estimation of [[Glossary:Item|item]]'s difficulty computed by [https://supermemo.guru/wiki/Algorithm_SM-18 Algorithm SM-18]. This number ranges from 0 (for easy [[Glossary:Item|items]]) to 1 (for difficult items). It is displayed as '''[[Element data#Diff|Diff]]''' in the [[Element data|'''Element data''' window]] (see: [https://supermemo.guru/wiki/Item_difficulty_in_Algorithm_SM-18 details])
:# current estimation of [[Glossary:Item|item]]'s absolute difficulty estimated by [https://supermemo.guru/wiki/Algorithm_SM-15 Algorithm SM-15]. This number ranges from 1.2 (for difficult [[Glossary:Item|items]]) to 6.9 (for easy items). It is represented by [[Glossary:A-Factor|A-Factor]] and displayed as '''A-Factor''' in the [[Element data|'''Element data''' window]]. This value reflects bounded [[stabilization]] for first review executed at optimum interval
:# heuristic measure of '''difficulty''' based on selected item data, and displayed in the [[Element data|'''Element data''' window]] as '''Old''' (this measure can be used to sort [[Glossary:Collection|collections]] that are to be used by other users; starting with easy [[Glossary:Item|items]] first)

Latest revision as of 17:51, 15 May 2019

difficulty
estimation of item's difficulty in SuperMemo. The three main measures of difficulty:
  1. current estimation of item's difficulty computed by Algorithm SM-18. This number ranges from 0 (for easy items) to 1 (for difficult items). It is displayed as Diff in the Element data window (see: details)
  2. current estimation of item's absolute difficulty estimated by Algorithm SM-15. This number ranges from 1.2 (for difficult items) to 6.9 (for easy items). It is represented by A-Factor and displayed as A-Factor in the Element data window. This value reflects bounded stabilization for first review executed at optimum interval
  3. heuristic measure of difficulty based on selected item data, and displayed in the Element data window as Old (this measure can be used to sort collections that are to be used by other users; starting with easy items first)
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