[MATH-1189] SimpleRegression may not report fit statistics correctly for perfect linear models

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Invalid
• Fix Version/s: 3.5
• Assignee: Unassigned
• Reporter: Phil Steitz
• Created: 10/Jan/15 01:15
• Updated: 18/Apr/15 09:19
• Resolved: 11/Jan/15 22:14

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:

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)