[jboss-jira] [JBoss JIRA] (DROOLS-1424) Variance and standard deviation function in Drools out of the box

[Geoffrey De Smet (JIRA)]

Geoffrey De Smet created DROOLS-1424:
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             Summary: Variance and standard deviation function in Drools out of the box
                 Key: DROOLS-1424
                 URL: https://issues.jboss.org/browse/DROOLS-1424
             Project: Drools
          Issue Type: Feature Request
          Components: core engine
            Reporter: Geoffrey De Smet
            Assignee: Mario Fusco


After a bunch of research I've found the way to do this efficiently:
  https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Online_algorithm
Simply use Welford's algorithm.



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