[ http://issues.apache.org/jira/browse/MATH-85?page=comments#action_12419186 ]
Phil Steitz commented on MATH-85: --------------------------------- I agree this is a corner case and the negative result is due to rounding. The question is, should we force the result to 0 when a negative value is returned by the computation? > [math] SimpleRegression getSumSquaredErrors > -------------------------------------------- > > Key: MATH-85 > URL: http://issues.apache.org/jira/browse/MATH-85 > Project: Commons Math > Type: Bug > Versions: 1.1.0 > Environment: Operating System: Windows 2000 > Platform: PC > Reporter: Mark Osborn > Attachments: math-85.patch > > 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 > > } -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://issues.apache.org/jira/secure/Administrators.jspa - For more information on JIRA, see: http://www.atlassian.com/software/jira --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
