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From: "Phil Steitz (JIRA)" <jira@apache.org>
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Subject: [jira] [Updated] (MATH-1189) SimpleRegression may not report fit
 statistics correctly for perfect linear models
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     [ https://issues.apache.org/jira/browse/MATH-1189?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Phil Steitz updated MATH-1189:
------------------------------
    Description: 
The getSignificance(), getRSquare() and getR() methods can return infinite values when they should return 0, 1 and 1 respectively if the sum of squared errors is exactly 0.

>From Jenkins test run:
{code}
java.lang.AssertionError: expected:<0.0> but was:<Infinity>
	at org.junit.Assert.fail(Assert.java:88)
	at org.junit.Assert.failNotEquals(Assert.java:743)
	at org.junit.Assert.assertEquals(Assert.java:494)
	at org.junit.Assert.assertEquals(Assert.java:592)
	at org.apache.commons.math3.stat.regression.SimpleRegressionTest.testPerfect(SimpleRegressionTest.java:546)
{code}

  was:The getSignificance(), getRSquare() and getR() methods can return infinite values when they should return 0, 1 and 1 respectively if the sum of squared errors is exactly 0.


> SimpleRegression may not report fit statistics correctly for perfect linear models
> ----------------------------------------------------------------------------------
>
>                 Key: MATH-1189
>                 URL: https://issues.apache.org/jira/browse/MATH-1189
>             Project: Commons Math
>          Issue Type: Bug
>    Affects Versions: 3.3
>            Reporter: Phil Steitz
>
> The getSignificance(), getRSquare() and getR() methods can return infinite values when they should return 0, 1 and 1 respectively if the sum of squared errors is exactly 0.
> From Jenkins test run:
> {code}
> java.lang.AssertionError: expected:<0.0> but was:<Infinity>
> 	at org.junit.Assert.fail(Assert.java:88)
> 	at org.junit.Assert.failNotEquals(Assert.java:743)
> 	at org.junit.Assert.assertEquals(Assert.java:494)
> 	at org.junit.Assert.assertEquals(Assert.java:592)
> 	at org.apache.commons.math3.stat.regression.SimpleRegressionTest.testPerfect(SimpleRegressionTest.java:546)
> {code}



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