[jira] [Created] (SOLR-13391) Add variance and standard deviation stream evaluators

["Nazerke Seidan (JIRA)" <ji...@apache.org>]

Nazerke Seidan created SOLR-13391:
-------------------------------------

             Summary: Add variance and standard deviation stream evaluators
                 Key: SOLR-13391
                 URL: https://issues.apache.org/jira/browse/SOLR-13391
             Project: Solr
          Issue Type: Improvement
      Security Level: Public (Default Security Level. Issues are Public)
          Components: streaming expressions
            Reporter: Nazerke Seidan


It seems variance and standard deviation stream evaluators are not supported by any of the solr version. For example, 

              let(echo="m,v,sd", arr=array(1,3,3), m=mean(a), v=var(a), sd=stddev(a))

So far, only the mean function is implemented. I think it is useful to have var and sttdev functions separately as a stream evaluator. 



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: dev-unsubscribe@lucene.apache.org
For additional commands, e-mail: dev-help@lucene.apache.org