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From "Chee Sing Lee (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (MATH-1477) MillerUpdatingRegression: ArrayIndexOutOfBounds when calling regress with variablesToInclude parameter
Date Tue, 09 Apr 2019 18:38:00 GMT

    [ https://issues.apache.org/jira/browse/MATH-1477?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16813700#comment-16813700
] 

Chee Sing Lee commented on MATH-1477:
-------------------------------------

Link to PR: [https://github.com/apache/commons-math/pull/104]

> MillerUpdatingRegression: ArrayIndexOutOfBounds when calling regress with variablesToInclude
parameter
> ------------------------------------------------------------------------------------------------------
>
>                 Key: MATH-1477
>                 URL: https://issues.apache.org/jira/browse/MATH-1477
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.6.1
>            Reporter: Chee Sing Lee
>            Priority: Major
>              Labels: easyfix, newbie, patch
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> When performing a regression with a subset of predictors, an ArrayIndexOutOfBounds exception
will occur for certain subset selections. For example, this appears to happen consistently
for regressions without a constant term when the predictor at index 0 is not selected.
> I do not understand at all algorithm used to reorder the predictors when a subset is
used, but the fix appears to be a simple correction to the indexing range in the for-loop
at line 1059 of MillerUpdatingRegression.java.
>  
> Patch with expanded unit test to follow shortly.



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