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https://issues.apache.org/jira/browse/ARROW-3122?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wes McKinney closed ARROW-3122.
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Resolution: Duplicate
Closing as duplicate
> [C++] Incremental Variance, Standard Deviation aggregators
> ----------------------------------------------------------
>
> Key: ARROW-3122
> URL: https://issues.apache.org/jira/browse/ARROW-3122
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Labels: analytics
>
> These must provide for degrees of freedom adjustment when yielding result
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