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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Updated: (MATH-411) Multiple Regression newSampleData methods inconsistently create / omit intercepts
Date Sat, 28 Aug 2010 22:16:53 GMT

     [ https://issues.apache.org/jira/browse/MATH-411?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Phil Steitz updated MATH-411:
-----------------------------

    Fix Version/s: 2.2

> Multiple Regression newSampleData methods inconsistently create / omit intercepts
> ---------------------------------------------------------------------------------
>
>                 Key: MATH-411
>                 URL: https://issues.apache.org/jira/browse/MATH-411
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 2.0, 2.1
>            Reporter: Phil Steitz
>             Fix For: 2.2
>
>
> The newSampleData(double[], nrows, ncols) method used in the unit tests adds a unitary
column to the design matrix, resulting in an intercept term being estimated among the regression
parameters.  The other newSampleData methods do not do this, forcing users to add the column
of "1"s to estimate models with intercept.  Behavior should be consistent and users should
not have to add the column.

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