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https://issues.apache.org/jira/browse/MADLIB-1211?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16410357#comment-16410357
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Frank McQuillan commented on MADLIB-1211:
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Condition number seems to be calculated correctly from what I can see. If the
independent var(s) are identical for each group, then the condition numbers
will be the same for each group too.
So marking as not a bug.
> Condition No. is the same value for all groups in output of linear regression
> with grouping cols
> ------------------------------------------------------------------------------------------------
>
> Key: MADLIB-1211
> URL: https://issues.apache.org/jira/browse/MADLIB-1211
> Project: Apache MADlib
> Issue Type: Bug
> Components: Module: Linear Regression
> Reporter: Rashmi Raghu
> Priority: Minor
> Fix For: v1.14
>
>
> The model output table for linear regression contains a column for condition
> number of the matrix. The value in this column is the same for all groups
> when linear regression is run with grouping columns (an unlikely occurrence
> in any realistic dataset).
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