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

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− | '''<span id="stability_increase_matrix">stability increase matrix</span>''' (also: '''SInc matrix''' or '''SInc[]''') - | + | '''<span id="stability_increase_matrix">stability increase matrix</span>''' (also: '''SInc matrix''' or '''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: (1) current stability, (2) current retrievability, and (3) 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 elapses since the last repetition relative to the optimum interval |

## Revision as of 17:41, 22 April 2016

**stability increase matrix** (also: **SInc matrix** or **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: (1) current stability, (2) current retrievability, and (3) 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 elapses since the last repetition relative to the optimum interval