[MATH-85] [math] SimpleRegression getSumSquaredErrors

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 1.1

Environment

Operating System: Windows 2000
Platform: PC

• Bugzilla Id: 39432
• Assignee: Unassigned
• Reporter: Mark Osborn
• Created: 28/Apr/06 00:00
• Updated: 06/Jul/06 12:11
• Resolved: 06/Jul/06 12:11

Description

getSumSquaredErrors returns -ve value. See test below:

public void testSimpleRegression() {
double[] y =

{ 8915.102, 8919.302, 8923.502}

;
double[] x =

{ 1.107178495, 1.107264895, 1.107351295}

;
double[] x2 =

{ 1.107178495E2, 1.107264895E2, 1.107351295E2}

;
SimpleRegression reg = new SimpleRegression();
for (int i = 0; i < x.length; i++)

{ reg.addData(x[i],y[i]); }

assertTrue(reg.getSumSquaredErrors() >= 0.0); // OK
reg.clear();
for (int i = 0; i < x.length; i++)

{ reg.addData(x2[i],y[i]); }

assertTrue(reg.getSumSquaredErrors() >= 0.0); // FAIL

}