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https://issues.apache.org/jira/browse/HBASE-5142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhihong Yu updated HBASE-5142:
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Comment: was deleted
(was: AggregationClient.std() already provides this capability.)
> Compute standard deviation using AggregateProtocol
> --------------------------------------------------
>
> Key: HBASE-5142
> URL: https://issues.apache.org/jira/browse/HBASE-5142
> Project: HBase
> Issue Type: Sub-task
> Reporter: Zhihong Yu
>
> Looking at http://en.wikipedia.org/wiki/Standard_deviation, I think two
> passes are involved in computing std:
> 1. compute average, u
> 2. tuple of (sum of (xi-u)*(xi-u), number of rows) is returned from each
> region
> 3. client computes std based on results from step 2
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