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  1. Drools
  2. DROOLS-1424

Variance and standard deviation function in Drools out of the box

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    • Feature Request
    • Resolution: Done
    • Major
    • 7.0.0.Beta8
    • None
    • core engine
    • None
    • NEW
    • NEW

    Description

      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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          relates to

          Enhancement - An enhancement to or refactoring of existing functionality that is not configurable by an end user (typically a change made by an internal team that affects users) PLANNER-713 Support for zero-based variance / standard deviation (for fairness/load balancing constraints) in Drools DRL in Tennis example

          • Blocker - To be worked above all other priorities. This term is chosen when the severity of the issue is very high, has no workaround, or the effort for the change is comparatively low. Issues that may be very publicly visible and could generate significant media attention may also drive a higher priority.
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              gdesmet@redhat.com Geoffrey De Smet (Inactive)
              gdesmet@redhat.com Geoffrey De Smet (Inactive)
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                Updated:
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