Glossary:O-Factor: Difference between revisions
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;<span id="O-Factor">O-Factor</span> (optimum factor; OF) | |||
:number which tells you how much [[Glossary:Interval|intervals]] should increase to reach recall of 90%. '''O-Factors''' differ for different levels of [[Glossary:Stability|memory stability]] and different [[Glossary:Difficulty|item difficulty]]. They are normalized for the [[Glossary:Forgetting_index|forgetting index]] of 10%. For the first [[Glossary:Repetition|repetition]], i.e. there was no prior interval, '''O-Factor''' is assumed to be the same as the first [[Glossary:Interval|interval]] (as if the prior interval was 1 day). For the first [[Glossary:Repetition|repetition]], different '''O-Factors''' are computed for a different number of [[Glossary:Lapse|memory lapses]]. For example: if the '''O-Factor''' is 2.5, and the prior [[Glossary:Interval|interval]] was 20 days, at repetition time, the new interval should be set to 2.5*20 days, i.e. 50 days. | |||
Latest revision as of 13:30, 26 May 2016
- O-Factor (optimum factor; OF)
- number which tells you how much intervals should increase to reach recall of 90%. O-Factors differ for different levels of memory stability and different item difficulty. They are normalized for the forgetting index of 10%. For the first repetition, i.e. there was no prior interval, O-Factor is assumed to be the same as the first interval (as if the prior interval was 1 day). For the first repetition, different O-Factors are computed for a different number of memory lapses. For example: if the O-Factor is 2.5, and the prior interval was 20 days, at repetition time, the new interval should be set to 2.5*20 days, i.e. 50 days.