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From brentwor...@apache.org
Subject svn commit: r645193 - in /commons/proper/math/trunk/src: java/org/apache/commons/math/stat/inference/TTestImpl.java site/xdoc/changes.xml
Date Sun, 06 Apr 2008 01:25:13 GMT
Author: brentworden
Date: Sat Apr  5 18:25:08 2008
New Revision: 645193

URL: http://svn.apache.org/viewvc?rev=645193&view=rev
Log:
MATH-201.  Fixed truncation error in t-test classes for large t values.

Modified:
    commons/proper/math/trunk/src/java/org/apache/commons/math/stat/inference/TTestImpl.java
    commons/proper/math/trunk/src/site/xdoc/changes.xml

Modified: commons/proper/math/trunk/src/java/org/apache/commons/math/stat/inference/TTestImpl.java
URL: http://svn.apache.org/viewvc/commons/proper/math/trunk/src/java/org/apache/commons/math/stat/inference/TTestImpl.java?rev=645193&r1=645192&r2=645193&view=diff
==============================================================================
--- commons/proper/math/trunk/src/java/org/apache/commons/math/stat/inference/TTestImpl.java
(original)
+++ commons/proper/math/trunk/src/java/org/apache/commons/math/stat/inference/TTestImpl.java
Sat Apr  5 18:25:08 2008
@@ -1006,7 +1006,7 @@
     throws MathException {
         double t = Math.abs(t(m, mu, v, n));
         distribution.setDegreesOfFreedom(n - 1);
-        return 1.0 - distribution.cumulativeProbability(-t, t);
+        return 2.0 * distribution.cumulativeProbability(-t);
     }
 
     /**
@@ -1031,7 +1031,7 @@
         double degreesOfFreedom = 0;
         degreesOfFreedom = df(v1, v2, n1, n2);
         distribution.setDegreesOfFreedom(degreesOfFreedom);
-        return 1.0 - distribution.cumulativeProbability(-t, t);
+        return 2.0 * distribution.cumulativeProbability(-t);
     }
     
     /**
@@ -1055,7 +1055,7 @@
         double t = Math.abs(homoscedasticT(m1, m2, v1, v2, n1, n2));
         double degreesOfFreedom = (double) (n1 + n2 - 2);
         distribution.setDegreesOfFreedom(degreesOfFreedom);
-        return 1.0 - distribution.cumulativeProbability(-t, t);
+        return 2.0 * distribution.cumulativeProbability(-t);
     }
     
     /**

Modified: commons/proper/math/trunk/src/site/xdoc/changes.xml
URL: http://svn.apache.org/viewvc/commons/proper/math/trunk/src/site/xdoc/changes.xml?rev=645193&r1=645192&r2=645193&view=diff
==============================================================================
--- commons/proper/math/trunk/src/site/xdoc/changes.xml (original)
+++ commons/proper/math/trunk/src/site/xdoc/changes.xml Sat Apr  5 18:25:08 2008
@@ -45,16 +45,19 @@
         Javadoc and style fixes.
       </action>
       <action dev="luc" type="fix" issue="MATH-198" due-to="Frederick Salardi">
-        added an error detection for missing imaginary character while parsing complex string
+        Added an error detection for missing imaginary character while parsing complex string
       </action>
       <action dev="luc" type="fix" issue="MATH-199" due-to="Mick">
-        detect numerical problems in Q.R decomposition for Levenberg-Marquardt estimator
+        Detect numerical problems in Q.R decomposition for Levenberg-Marquardt estimator
         and report them appropriately
       </action>
       <action dev="luc" type="fix" issue="MATH-200" due-to="Plamen Petrov">
-        fixed several crashes in getCovariances() and guessParametersErrors() in
+        Fixed several crashes in getCovariances() and guessParametersErrors() in
         AbstractEstimator when some parameters are bound. The methods now explicitly
         give result only about unbound parameters.
+      </action>
+      <action dev="brentworden" type="fix" issue="MATH-201" due-to="Peter Wyngaard">
+        Fixed truncation error in t-test classes for large t values.
       </action>
     </release>
     <release version="1.2" date="2008-02-24"



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