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https://issues.apache.org/jira/browse/MATH-1280?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14947076#comment-14947076
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Marlon Gaspar Machado commented on MATH-1280:
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Version 3.5 is also affected. I will download version 3.6 and test it.
> DescriptiveStatistics methods return NaN for operations on arrays with single
> items
> -----------------------------------------------------------------------------------
>
> Key: MATH-1280
> URL: https://issues.apache.org/jira/browse/MATH-1280
> Project: Commons Math
> Issue Type: Bug
> Affects Versions: 3.4
> Reporter: Marlon Gaspar Machado
>
> 1. Create a DescriptiveStatistics object passing an array with only one value
> 2. Call getMean() method
> 3. Call getStandardDeviation() method
> 4. Both return NaN
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