From 66bee595ebec626b605adf74d54b02d57709816e Mon Sep 17 00:00:00 2001 From: Luc Maisonobe Date: Wed, 23 Feb 2011 09:55:30 +0000 Subject: [PATCH] updated release notes to include behavior changes in multiple regression git-svn-id: https://svn.apache.org/repos/asf/commons/proper/math/branches/MATH_2_X@1073663 13f79535-47bb-0310-9956-ffa450edef68 --- RELEASE-NOTES.txt | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/RELEASE-NOTES.txt b/RELEASE-NOTES.txt index 53694389b..81b237cae 100644 --- a/RELEASE-NOTES.txt +++ b/RELEASE-NOTES.txt @@ -14,6 +14,12 @@ This release contains some minor compatibility breaks with version 2.1 in some i 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 ...;