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From l..@apache.org
Subject svn commit: r1073663 - /commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt
Date Wed, 23 Feb 2011 09:55:30 GMT
Author: luc
Date: Wed Feb 23 09:55:30 2011
New Revision: 1073663

URL: http://svn.apache.org/viewvc?rev=1073663&view=rev
Log:
updated release notes to include behavior changes in multiple regression

Modified:
    commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt

Modified: commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt
URL: http://svn.apache.org/viewvc/commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt?rev=1073663&r1=1073662&r2=1073663&view=diff
==============================================================================
--- commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt (original)
+++ commons/proper/math/branches/MATH_2_X/RELEASE-NOTES.txt Wed Feb 23 09:55:30 2011
@@ -14,6 +14,12 @@ This release contains some minor compati
  the arguments of the EventState.reinitializeBegin method have changed;
  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;
  a new package for floating point arbitrary precision computing, including high level functions
like exponential, sine, square root ...;



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