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