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https://issues.apache.org/jira/browse/MATH-1178?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Gilles resolved MATH-1178.
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Resolution: Fixed
Fix Version/s: 3.4
Thanks for the report.
Fixed in commit 5d6e445484d75dad938cece6fd690427ea648203
> Incorrect sample of usage of StatUtils at homepage
> --------------------------------------------------
>
> Key: MATH-1178
> URL: https://issues.apache.org/jira/browse/MATH-1178
> Project: Commons Math
> Issue Type: Bug
> Environment: Documentation at
> http://commons.apache.org/proper/commons-math/userguide/stat.html
> Reporter: Dmitriy
> Priority: Trivial
> Fix For: 3.4
>
> Original Estimate: 10m
> Remaining Estimate: 10m
>
> At http://commons.apache.org/proper/commons-math/userguide/stat.html you are
> providing three ways to compute mean, std, median with DescriptiveStatistics,
> SummaryStatistics, StatUtils.
> But when you execute double std = StatUtils.variance(values), you are not
> actually get std in std, you get std*std, because DescriptiveStatistics
> actually returns FastMath.sqrt(getVariance()), but StatUtils returns variance
> directly.
> The solution is to substitute "double std = StatUtils.variance(values);" with
> "double std = FastMath.sqrt(StatUtils.variance(values));"
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