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"
