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https://issues.apache.org/jira/browse/MADLIB-1166?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16273610#comment-16273610
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ASF GitHub Bot commented on MADLIB-1166:
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GitHub user Swatisoni opened a pull request:
https://github.com/apache/madlib/pull/206
Feature: Allow NULL in rows for computing correlations and covariance
JIRA: MADLIB-1166
Additional Authors:
Orhan Kislal <[email protected]>
- Replace NULL values with the mean of corresponding column.
You can merge this pull request into a Git repository by running:
$ git pull https://github.com/Swatisoni/madlib feature/corr_null3
Alternatively you can review and apply these changes as the patch at:
https://github.com/apache/madlib/pull/206.patch
To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:
This closes #206
----
commit 5de8a1c9c877401552cde5b46e666af724867484
Author: Swatisoni <[email protected]>
Date: 2017-11-30T22:52:09Z
Feature: Allow NULL in rows for computing correlations and covariance
JIRA: MADLIB-1166
Additional Authors:
Orhan Kislal <[email protected]>
- Replace NULL values with the mean of corresponding column.
----
> Correlation - do not drop whole row if a target column is NULL
> --------------------------------------------------------------
>
> Key: MADLIB-1166
> URL: https://issues.apache.org/jira/browse/MADLIB-1166
> Project: Apache MADlib
> Issue Type: Improvement
> Components: Module: Descriptive Statistics
> Reporter: Frank McQuillan
> Priority: Minor
> Fix For: v1.13
>
>
> http://madlib.apache.org/docs/latest/group__grp__correlation.html
> Current implementation ignores a row that contains NULL entirely. This means
> any correlation in such a row (with NULLs) does not contribute to the final
> answer.
> This improvement is not to drop the whole row if a target column is NULL, but
> rather to do pairwise correlation for any target columns that exist, to make
> most use of the data.
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