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From pste...@apache.org
Subject svn commit: r1073569 - /commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml
Date Wed, 23 Feb 2011 01:07:11 GMT
Author: psteitz
Date: Wed Feb 23 01:07:11 2011
New Revision: 1073569

URL: http://svn.apache.org/viewvc?rev=1073569&view=rev
Log:
Added note on multiple regression behavior change.

Modified:
    commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml

Modified: commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml
URL: http://svn.apache.org/viewvc/commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml?rev=1073569&r1=1073568&r2=1073569&view=diff
==============================================================================
--- commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml (original)
+++ commons/proper/math/branches/MATH_2_X/src/site/xdoc/changes.xml Wed Feb 23 01:07:11 2011
@@ -62,7 +62,13 @@ This is primarily a maintenance release,
   of them are in APIs likely to be accessed by user code:
   the MessagesResources_fr class has been removed (replaced by a properties file);
   the arguments of the EventState.reinitializeBegin method have changed;
-  some protected fields which already had public accessors in AbstractStepInterpolator have
been replaced.
+  some protected fields which already had public accessors in AbstractStepInterpolator have
been replaced.  
+  
+  There is a behavior change that users of the multiple regression classes should be aware
of. In version
+  2.1, there was no way to estimate models without intercept terms, and, while this was not
clear from
+  the documentation, design (X) matrices needed to include initial unitary columns.  In 2.2,
initial 
+  unitary columns are not necessary and whether or not models include intercept terms is
configurable.
+  See the change log and javadoc for the classes in org.apache.commons.math.stat.regression
for details.
 
   The major new features are:
   a new FastMath class, both faster, more accurate and with a few additional functions than
StrictMath and Math;



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