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https://issues.apache.org/jira/browse/MAHOUT-1040?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13407801#comment-13407801
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Sean Owen commented on MAHOUT-1040:
-----------------------------------
No, they are used by Mahout! Did you look at the classes I pointed you to?
The point of separating out standard deviation into a subclass is that you need
three additional doubles to efficiently update and retrieve it. That's 24
bytes. There are places where a running average is needed, tens of millions of
of them, without standard deviation. The price of combining them into a common
class is 100MB of heap; it's not a good thing.
Trust me -- this is all by design.
> Simplify RunningAverage suite
> -----------------------------
>
> Key: MAHOUT-1040
> URL: https://issues.apache.org/jira/browse/MAHOUT-1040
> Project: Mahout
> Issue Type: Improvement
> Reporter: Lance Norskog
> Priority: Minor
>
> The RunningAverage suite of classes is not used in the Mahout source base,
> except for FullRunningAverage.
> Would it be acceptable to the Mahout user base to collapse this feature into
> one class?
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