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https://issues.apache.org/jira/browse/MATH-1428?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16123215#comment-16123215
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Gilles commented on MATH-1428:
------------------------------

What result did you expect?
What do other libraries produce?

Also, please provide a _minimal_ working code (preferably a JUnit test) example.


> OLSMultipleLinearRegression estimates different  residuals with different 
> order of input
> ----------------------------------------------------------------------------------------
>
>                 Key: MATH-1428
>                 URL: https://issues.apache.org/jira/browse/MATH-1428
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.4.1
>         Environment: win7  64bit  jdk1.8  intelljidea 
>            Reporter: butchild
>              Labels: ols, regression, residuals
>
> I have a regression job with  31 X  ,which 30 of them are dummys .
> And the length of data is 800+ .
> I'm using OLSMultipleLinearRegression to do regression.
> I found if I change the order of the 800+ data, the residuals I got from  
> ols.estimateResiduals()
> are differents ,and  the correlation of the two differet  rersiduals is near 
> 100%,like 99.8%.
> My data is below in Docs Text area.
> The fields of each Column is :
> sig,y,x1,x2,........xn



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