# Difference between revisions of "Glossary:Stability increase matrix"

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− | + | ;<span id="stability_increase_matrix">stability increase matrix</span> (SInc matrix; SInc[]) | |

+ | :the matrix that represents the function of interval/stability increase in [[SuperMemo Algorithm|Algorithm SM-17]]. For any [[Glossary:Item|item]] at any time, the increase in [[Glossary:Stability|stability]] depends on: | ||

+ | :#current stability, | ||

+ | :#current [[Glossary:Retrievability|retrievability]], and | ||

+ | :#current item [[Glossary:Difficulty|difficulty]]. | ||

+ | :This function can be inspected using: '''[[Tools menu|Tools]] : [[Tools menu#Memory|Memory]] : [[Memory graphs (4D)|4D Graphs]] : [[Memory graphs (4D)#Stability increase function|Stability]]''' in SuperMemo. The '''SInc[] matrix''' can be considered an extension of the [[Glossary:OF_matrix|OF matrix]] (from older SuperMemos) into the dimension of [[Glossary:Retrievability|retrievability]]. This means that the new [[SuperMemo Algorithm|Algorithm SM-17]] can handle any [[Glossary:Repetition|repetition]] at any time, including freshly reviewed [[Glossary:Item|items]], as well as long-neglected items. [[Glossary:Retrievability|Retrievability]] is the dimension that reflects the time that has elapsed since the last repetition relative to the [[Glossary:Optimum_interval|optimum interval]] |

## Revision as of 18:35, 26 May 2016

- stability increase matrix (SInc matrix; SInc[])
- the matrix that represents the function of interval/stability increase in Algorithm SM-17. For any item at any time, the increase in stability depends on:
- current stability,
- current retrievability, and
- current item difficulty.

- This function can be inspected using:
**Tools : Memory : 4D Graphs : Stability**in SuperMemo. The**SInc[] matrix**can be considered an extension of the OF matrix (from older SuperMemos) into the dimension of retrievability. This means that the new Algorithm SM-17 can handle any repetition at any time, including freshly reviewed items, as well as long-neglected items. Retrievability is the dimension that reflects the time that has elapsed since the last repetition relative to the optimum interval