[jboss-jira] [JBoss JIRA] Created: (JBRULES-3056) Include Standard Deviation accumulate function

[Radoslav Husar (JIRA)]

Include Standard Deviation accumulate function 
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                 Key: JBRULES-3056
                 URL: https://issues.jboss.org/browse/JBRULES-3056
             Project: Drools
          Issue Type: Feature Request
      Security Level: Public (Everyone can see)
    Affects Versions: 5.2.0.M2
            Reporter: Radoslav Husar
            Assignee: Mark Proctor
            Priority: Minor


Hi guys, 
I think we should add  the standard deviation  to accumulate functions (even excel has it ;-) I went through the Jira there is no similar request, although people are asking about it on the mailing list - so why not make their lives easier? 
http://lists.jboss.org/pipermail/rules-users/2011-April/019494.html

It can nicely reside here with others
https://github.com/droolsjbpm/drools/tree/master/drools-core/src/main/java/org/drools/base/accumulators

Edson's article on how to add custome ones
http://blog.athico.com/2007/06/accumulate-functions-edson-tirelli.html

If it sounds feasible assign back to me and  I can try to contribute,
Cheers.

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