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Jeff Moser
2010-10-03 22:11:38 -04:00
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The core ideas used in this PHPSkills project were described in
"TrueSkill (TM): A Bayesian Skill Rating System" available at
http://research.microsoft.com/apps/pubs/default.aspx?id=67956
The authors of the above paper have asked for a link to that article
as attribution in derived works.
Some concepts were based on sample F# code that was written by Ralf Herbrich
Copyright (c) 2007, 2008 Microsoft Research Ltd, available at
http://blogs.technet.com/apg/archive/2008/06/16/trueskill-in-f.aspx
This PHP code was ported from the C# Moserware.Skills project at
http://github.com/moserware/Skills
Both the PHP code in this PHPSkills project and C# in Moserware.Skills are
Copyright (c) 2010 Jeff Moser <jeff@moserware.com>
Redistribution and use in source and binary forms, with or without modification, are
permitted provided that the following conditions are met:
1. Redistributions of source code must retain the above copyright notice, this list of
conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright notice, this list
of conditions and the following disclaimer in the documentation and/or other materials
provided with the distribution.
THIS SOFTWARE IS PROVIDED BY JEFF MOSER ``AS IS'' AND ANY EXPRESS OR IMPLIED
WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL JEFF MOSER OR
CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
The views and conclusions contained in the software and documentation are those of the
authors and should not be interpreted as representing official policies, either expressed
or implied, of Jeff Moser.