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https://issues.apache.org/jira/browse/STATISTICS-80?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Alex Herbert resolved STATISTICS-80.
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Resolution: Implemented
Added in commit:
8564fc95e122fdf69953603583af0fa559ebf68e
> Implement Variance
> ------------------
>
> Key: STATISTICS-80
> URL: https://issues.apache.org/jira/browse/STATISTICS-80
> Project: Commons Statistics
> Issue Type: Sub-task
> Components: descriptive
> Reporter: Anirudh Joshi
> Priority: Minor
> Fix For: 1.1
>
>
> Computes the variance according to the +[SecondMoment.increment(double
> d)|https://github.com/apache/commons-math/blob/9e02432e06501f94690e172f3856450cd3a55a20/commons-math-legacy/src/main/java/org/apache/commons/math4/legacy/stat/descriptive/moment/SecondMoment.java#L73]+
> method in {{commons-math}} library. If the input array is known beforehand,
> such as in the {{Variance.of(double... values)}} method, a more accurate
> variance is computed using a two-pass, corrected algorithm, starting with
> computing the sum of squared deviations from mean and then correcting this by
> adding the squared sum of deviations normalized by the sample size.
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