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    <title>MongoDB Jira</title>
    <link>https://jira.mongodb.org</link>
    <description>This file is an XML representation of an issue</description>
    <language>en-us</language>    <build-info>
        <version>9.7.1</version>
        <build-number>970001</build-number>
        <build-date>13-04-2023</build-date>
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<item>
            <title>[SERVER-5044] $stdDev aggregation operator for standard deviation</title>
                <link>https://jira.mongodb.org/browse/SERVER-5044</link>
                <project id="10000" key="SERVER">Core Server</project>
                    <description>&lt;p&gt;see &lt;a href=&quot;https://gist.github.com/1886960&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://gist.github.com/1886960&lt;/a&gt; for an algorithm to handle calculating standard deviation and variance across many servers.&lt;/p&gt;</description>
                <environment></environment>
        <key id="31280">SERVER-5044</key>
            <summary>$stdDev aggregation operator for standard deviation</summary>
                <type id="2" iconUrl="https://jira.mongodb.org/secure/viewavatar?size=xsmall&amp;avatarId=14711&amp;avatarType=issuetype">New Feature</type>
                                            <priority id="3" iconUrl="https://jira.mongodb.org/images/icons/priorities/major.svg">Major - P3</priority>
                        <status id="6" iconUrl="https://jira.mongodb.org/images/icons/statuses/closed.png" description="The issue is considered finished, the resolution is correct. Issues which are closed can be reopened.">Closed</status>
                    <statusCategory id="3" key="done" colorName="success"/>
                                    <resolution id="9">Done</resolution>
                                        <assignee username="mathias@mongodb.com">Mathias Stearn</assignee>
                                    <reporter username="mathias@mongodb.com">Mathias Stearn</reporter>
                        <labels>
                            <label>pull-request</label>
                    </labels>
                <created>Wed, 22 Feb 2012 20:39:10 +0000</created>
                <updated>Sun, 6 Jan 2019 06:55:23 +0000</updated>
                            <resolved>Tue, 16 Jun 2015 18:31:20 +0000</resolved>
                                                    <fixVersion>3.1.5</fixVersion>
                                    <component>Aggregation Framework</component>
                                        <votes>25</votes>
                                    <watches>26</watches>
                                                                                                                <comments>
                            <comment id="936608" author="xgen-internal-githook" created="Wed, 10 Jun 2015 17:27:01 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5044&quot; title=&quot;$stdDev aggregation operator for standard deviation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5044&quot;&gt;&lt;del&gt;SERVER-5044&lt;/del&gt;&lt;/a&gt; Use relative error when testing sharded $stdDev operations&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/faf0663603ed7a27f8c726245b005caa50065f81&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/faf0663603ed7a27f8c726245b005caa50065f81&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="935615" author="xgen-internal-githook" created="Tue, 9 Jun 2015 20:33:41 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5044&quot; title=&quot;$stdDev aggregation operator for standard deviation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5044&quot;&gt;&lt;del&gt;SERVER-5044&lt;/del&gt;&lt;/a&gt; Standard Deviation accumulator operators&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/ac0ff84d3fd4c127af8cbcea560d3793a3c3f131&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/ac0ff84d3fd4c127af8cbcea560d3793a3c3f131&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="819999" author="itsmejainh" created="Tue, 3 Feb 2015 13:25:12 +0000"  >&lt;p&gt;Hey, It&apos;s a nice to have feature. &lt;br/&gt;
Any updates on this ?&lt;/p&gt;</comment>
                            <comment id="483440" author="kevinldavenport" created="Thu, 16 Jan 2014 23:32:26 +0000"  >&lt;p&gt;This is a must have.&lt;/p&gt;</comment>
                            <comment id="444033" author="auto" created="Mon, 21 Oct 2013 18:19:49 +0000"  >&lt;p&gt;Author:&lt;/p&gt;
{u&apos;username&apos;: u&apos;RedBeard0531&apos;, u&apos;name&apos;: u&apos;Mathias Stearn&apos;, u&apos;email&apos;: u&apos;mathias@10gen.com&apos;}
&lt;p&gt;Message: Clean up AccumulatorAvg&lt;/p&gt;

&lt;p&gt;Major change is not inheriting from AccumulatorSum&lt;/p&gt;

&lt;p&gt;Prep for &lt;a href=&quot;https://jira.mongodb.org/browse/SERVER-5044&quot; title=&quot;$stdDev aggregation operator for standard deviation&quot; class=&quot;issue-link&quot; data-issue-key=&quot;SERVER-5044&quot;&gt;&lt;del&gt;SERVER-5044&lt;/del&gt;&lt;/a&gt; $stdDev accumulator&lt;br/&gt;
Branch: master&lt;br/&gt;
&lt;a href=&quot;https://github.com/mongodb/mongo/commit/982d5d281806d470696809d11dceaa098aed4906&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/commit/982d5d281806d470696809d11dceaa098aed4906&lt;/a&gt;&lt;/p&gt;</comment>
                            <comment id="390039" author="msven" created="Sat, 27 Jul 2013 15:31:31 +0000"  >&lt;p&gt;I opened a pull request for this today. &lt;a href=&quot;https://github.com/mongodb/mongo/pull/464&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/464&lt;/a&gt; &lt;/p&gt;

&lt;p&gt;This implements standard deviation and variance calculations using the algorithm listed in the description.&lt;/p&gt;</comment>
                            <comment id="379737" author="ranjith19" created="Fri, 12 Jul 2013 13:03:00 +0000"  >&lt;p&gt;Any idea if this will be picked up at all?&lt;/p&gt;</comment>
                            <comment id="376600" author="matt.kangas@10gen.com" created="Mon, 8 Jul 2013 22:09:06 +0000"  >&lt;p&gt;Closed &lt;a href=&quot;https://github.com/mongodb/mongo/pull/409&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/mongodb/mongo/pull/409&lt;/a&gt; due to inactivity&lt;/p&gt;</comment>
                            <comment id="305648" author="base698" created="Thu, 4 Apr 2013 04:42:34 +0000"  >&lt;p&gt;I started this today.  Here is the commit in github.  &lt;a href=&quot;https://github.com/base698/mongo/commit/2f9ab97ffb6f027faf4c503ba4a58e500eb6fb23&quot; class=&quot;external-link&quot; target=&quot;_blank&quot; rel=&quot;nofollow noopener&quot;&gt;https://github.com/base698/mongo/commit/2f9ab97ffb6f027faf4c503ba4a58e500eb6fb23&lt;/a&gt;&lt;/p&gt;

&lt;p&gt;It needs tests and variance.  It probably could be refactored to do average, variance and standard deviation in one motion since you have to do it incrementally.&lt;/p&gt;
</comment>
                            <comment id="92901" author="redbeard0531" created="Mon, 27 Feb 2012 17:20:53 +0000"  >&lt;p&gt;Correct.&lt;/p&gt;

&lt;p&gt;Ideally any $group op should be usable in a $project against an array field, but that is a different issue.&lt;/p&gt;</comment>
                            <comment id="91149" author="cwestin" created="Wed, 22 Feb 2012 23:41:06 +0000"  >&lt;p&gt;I&apos;m assuming this is meant to be for $group.&lt;/p&gt;</comment>
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            <issuekey id="665866">SERVER-38851</issuekey>
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            <issuekey id="225160">CSHARP-1367</issuekey>
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            <issuekey id="227211">JAVA-1935</issuekey>
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