<?xml version="1.0"?>
<feed xmlns="http://www.w3.org/2005/Atom" xml:lang="en">
	<id>https://help18.whiz.me/index.php?action=history&amp;feed=atom&amp;title=Glossary%3AO-Factor</id>
	<title>Glossary:O-Factor - Revision history</title>
	<link rel="self" type="application/atom+xml" href="https://help18.whiz.me/index.php?action=history&amp;feed=atom&amp;title=Glossary%3AO-Factor"/>
	<link rel="alternate" type="text/html" href="https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;action=history"/>
	<updated>2026-06-17T12:13:30Z</updated>
	<subtitle>Revision history for this page on the wiki</subtitle>
	<generator>MediaWiki 1.43.0</generator>
	<entry>
		<id>https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=9003&amp;oldid=prev</id>
		<title>SuperMemoHelp at 17:30, 26 May 2016</title>
		<link rel="alternate" type="text/html" href="https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=9003&amp;oldid=prev"/>
		<updated>2016-05-26T17:30:59Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 13:30, 26 May 2016&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/del&gt;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;O-Factor&amp;lt;/span&amp;gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/del&gt;(&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;also: &#039;&#039;&#039;&lt;/del&gt;optimum factor&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; or &#039;&#039;&#039;&lt;/del&gt;OF&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/del&gt;) &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;- a &lt;/del&gt;number which tells you how much [[Glossary:Interval|intervals]] should increase to reach recall of 90%. &#039;&#039;&#039;O-Factors&#039;&#039;&#039; 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, &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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 &#039;&#039;&#039;O-Factors&#039;&#039;&#039; are computed for a different number of [[Glossary:Lapse|memory lapses]]. For example: if the &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;;&lt;/ins&gt;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;O-Factor&amp;lt;/span&amp;gt; (optimum factor&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;; &lt;/ins&gt;OF)&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-side-deleted&quot;&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;:&lt;/ins&gt;number which tells you how much [[Glossary:Interval|intervals]] should increase to reach recall of 90%. &#039;&#039;&#039;O-Factors&#039;&#039;&#039; 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, &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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 &#039;&#039;&#039;O-Factors&#039;&#039;&#039; are computed for a different number of [[Glossary:Lapse|memory lapses]]. For example: if the &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>SuperMemoHelp</name></author>
	</entry>
	<entry>
		<id>https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=8338&amp;oldid=prev</id>
		<title>SuperMemoBeta at 07:43, 29 April 2016</title>
		<link rel="alternate" type="text/html" href="https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=8338&amp;oldid=prev"/>
		<updated>2016-04-29T07:43:12Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 03:43, 29 April 2016&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&#039;&#039;&#039;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;O-Factor&amp;lt;/span&amp;gt;&#039;&#039;&#039; (also: &#039;&#039;&#039;optimum factor&#039;&#039;&#039; or &#039;&#039;&#039;OF&#039;&#039;&#039;) - a number which tells you how much [[Glossary:Interval|intervals]] should increase &lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;in the optimum case&lt;/del&gt;. &#039;&#039;&#039;O-Factors&#039;&#039;&#039; 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, &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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 &#039;&#039;&#039;O-Factors&#039;&#039;&#039; are computed for a different number of [[Glossary:Lapse|memory lapses]]. For example: if the &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&#039;&#039;&#039;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;O-Factor&amp;lt;/span&amp;gt;&#039;&#039;&#039; (also: &#039;&#039;&#039;optimum factor&#039;&#039;&#039; or &#039;&#039;&#039;OF&#039;&#039;&#039;) - a number which tells you how much [[Glossary:Interval|intervals]] should increase &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;to reach recall of 90%&lt;/ins&gt;. &#039;&#039;&#039;O-Factors&#039;&#039;&#039; 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, &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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 &#039;&#039;&#039;O-Factors&#039;&#039;&#039; are computed for a different number of [[Glossary:Lapse|memory lapses]]. For example: if the &#039;&#039;&#039;O-Factor&#039;&#039;&#039; 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.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>SuperMemoBeta</name></author>
	</entry>
	<entry>
		<id>https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=7597&amp;oldid=prev</id>
		<title>SuperMemoHelp at 16:33, 3 April 2016</title>
		<link rel="alternate" type="text/html" href="https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=7597&amp;oldid=prev"/>
		<updated>2016-04-03T16:33:14Z</updated>

		<summary type="html">&lt;p&gt;&lt;/p&gt;
&lt;table style=&quot;background-color: #fff; color: #202122;&quot; data-mw=&quot;interface&quot;&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;col class=&quot;diff-marker&quot; /&gt;
				&lt;col class=&quot;diff-content&quot; /&gt;
				&lt;tr class=&quot;diff-title&quot; lang=&quot;en&quot;&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;← Older revision&lt;/td&gt;
				&lt;td colspan=&quot;2&quot; style=&quot;background-color: #fff; color: #202122; text-align: center;&quot;&gt;Revision as of 12:33, 3 April 2016&lt;/td&gt;
				&lt;/tr&gt;&lt;tr&gt;&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot; id=&quot;mw-diff-left-l1&quot;&gt;Line 1:&lt;/td&gt;
&lt;td colspan=&quot;2&quot; class=&quot;diff-lineno&quot;&gt;Line 1:&lt;/td&gt;&lt;/tr&gt;
&lt;tr&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;−&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #ffe49c; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/del&gt;O-Factor&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/del&gt;&amp;lt;/span&amp;gt; (also: &#039;&#039;&#039;optimum factor&#039;&#039;&#039; or &#039;&#039;&#039;OF&#039;&#039;&#039;) - a number which tells you how much intervals should increase in the optimum case. O-Factors differ for different levels of [[Glossary:Stability|memory stability]] and different [[Glossary:Difficulty|item difficulty]]. They are normalized for the [[Glossary:&lt;del style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Forgetting index&lt;/del&gt;|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.&lt;/div&gt;&lt;/td&gt;&lt;td class=&quot;diff-marker&quot; data-marker=&quot;+&quot;&gt;&lt;/td&gt;&lt;td style=&quot;color: #202122; font-size: 88%; border-style: solid; border-width: 1px 1px 1px 4px; border-radius: 0.33em; border-color: #a3d3ff; vertical-align: top; white-space: pre-wrap;&quot;&gt;&lt;div&gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/ins&gt;&amp;lt;span id=&quot;O-Factor&quot;&amp;gt;O-Factor&amp;lt;/span&amp;gt;&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/ins&gt;(also: &#039;&#039;&#039;optimum factor&#039;&#039;&#039; or &#039;&#039;&#039;OF&#039;&#039;&#039;) - a number which tells you how much &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Interval|&lt;/ins&gt;intervals&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]] &lt;/ins&gt;should increase in the optimum case. &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/ins&gt;O-Factors&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/ins&gt;differ for different levels of [[Glossary:Stability|memory stability]] and different [[Glossary:Difficulty|item difficulty]]. They are normalized for the [[Glossary:&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;Forgetting_index&lt;/ins&gt;|forgetting index]] of 10%. For the first &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Repetition|&lt;/ins&gt;repetition&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]]&lt;/ins&gt;, i.e. there was no prior interval, &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/ins&gt;O-Factor&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/ins&gt;is assumed to be the same as the first &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Interval|&lt;/ins&gt;interval&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]] &lt;/ins&gt;(as if the prior interval was 1 day). For the first &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Repetition|&lt;/ins&gt;repetition&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]]&lt;/ins&gt;, different &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/ins&gt;O-Factors&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/ins&gt;are computed for a different number of &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Lapse|&lt;/ins&gt;memory lapses&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]]&lt;/ins&gt;. For example: if the &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039;&lt;/ins&gt;O-Factor&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;&#039;&#039;&#039; &lt;/ins&gt;is 2.5, and the prior &lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;[[Glossary:Interval|&lt;/ins&gt;interval&lt;ins style=&quot;font-weight: bold; text-decoration: none;&quot;&gt;]] &lt;/ins&gt;was 20 days, at repetition time, the new interval should be set to 2.5*20 days, i.e. 50 days.&lt;/div&gt;&lt;/td&gt;&lt;/tr&gt;
&lt;/table&gt;</summary>
		<author><name>SuperMemoHelp</name></author>
	</entry>
	<entry>
		<id>https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=3942&amp;oldid=prev</id>
		<title>SuperMemoHelp: New entry added from SMPedia</title>
		<link rel="alternate" type="text/html" href="https://help18.whiz.me/index.php?title=Glossary:O-Factor&amp;diff=3942&amp;oldid=prev"/>
		<updated>2013-10-03T19:46:01Z</updated>

		<summary type="html">&lt;p&gt;New entry added from SMPedia&lt;/p&gt;
&lt;p&gt;&lt;b&gt;New page&lt;/b&gt;&lt;/p&gt;&lt;div&gt;&amp;lt;span id=&amp;quot;O-Factor&amp;quot;&amp;gt;&amp;#039;&amp;#039;&amp;#039;O-Factor&amp;#039;&amp;#039;&amp;#039;&amp;lt;/span&amp;gt; (also: &amp;#039;&amp;#039;&amp;#039;optimum factor&amp;#039;&amp;#039;&amp;#039; or &amp;#039;&amp;#039;&amp;#039;OF&amp;#039;&amp;#039;&amp;#039;) - a number which tells you how much intervals should increase in the optimum case. 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 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.&lt;/div&gt;</summary>
		<author><name>SuperMemoHelp</name></author>
	</entry>
</feed>