[jira] [Created] (HIVEMALL-131) Add documentation about Stratified Sampling in general tips

Mon, 10 Jul 2017 23:04:17 -0700 

Makoto Yui created HIVEMALL-131:
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             Summary: Add documentation about Stratified Sampling in general 
tips
                 Key: HIVEMALL-131
                 URL: https://issues.apache.org/jira/browse/HIVEMALL-131
             Project: Hivemall
          Issue Type: Sub-task
            Reporter: Makoto Yui
            Assignee: Makoto Yui
            Priority: Minor


[Stratified Sampling|
https://en.wikipedia.org/wiki/Stratified_sampling] using SQL is valuable and 
should be documented.

https://gist.github.com/myui/649c08cd2fb951e94eb4fa215eaf9df2
https://stackoverflow.com/questions/30235542/sql-random-sample-with-groups




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