You are viewing a plain text version of this content. The canonical link for it is here.
Posted to issues@hbase.apache.org by "Zhihong Yu (Updated) (JIRA)" <ji...@apache.org> on 2012/01/09 01:33:39 UTC
[jira] [Updated] (HBASE-5142) Compute standard deviation using
AggregateProtocol
[ https://issues.apache.org/jira/browse/HBASE-5142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Zhihong Yu updated HBASE-5142:
------------------------------
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
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators: https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira