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From "Phil Steitz (JIRA)" <j...@apache.org>
Subject [jira] Created: (MATH-411) Multiple Regression newSampleData methods inconsistently create / omit intercepts
Date Sat, 28 Aug 2010 22:14:53 GMT
Multiple Regression newSampleData methods inconsistently create / omit intercepts
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                 Key: MATH-411
                 URL: https://issues.apache.org/jira/browse/MATH-411
             Project: Commons Math
          Issue Type: Bug
    Affects Versions: 2.1, 2.0
            Reporter: Phil Steitz


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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