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https://issues.apache.org/jira/browse/SOLR-10590?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Cassandra Targett updated SOLR-10590:
-------------------------------------
Component/s: streaming expressions
> Add Cross Correlation Stream Evaluator
> --------------------------------------
>
> Key: SOLR-10590
> URL: https://issues.apache.org/jira/browse/SOLR-10590
> Project: Solr
> Issue Type: New Feature
> Security Level: Public(Default Security Level. Issues are Public)
> Components: streaming expressions
> Reporter: Joel Bernstein
> Fix For: 7.0
>
>
> Now that we have basic correlation (SOLR-10582) implemented we can use it at
> as a basis for cross correlation. Apache commons math apparently does not
> have a cross correlation implementation, so it will need to be implemented.
> The basic approach taken will be to slide columnA along columnB and perform
> the correlation calculation until correlation is either 1.0 or max lag has
> been reached.
> Both *auto-correlation* and *auto-regression* can be built on top the
> cross-collation function.
> If anyone has an alternative more efficient approach or knows of an existing
> implementation that can be plugged in, please let me know.
> Syntax:
> {code}
> let(a=expr,
> b=expr,
> c=col(a, fieldName),
> d=col(b, fieldName),
> tuple(corr=xcorr(c,d,10)))
> {code}
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