From: Ross Dickson ACHILLES NET>
Date: 28 may 2003
Subject: Re: Dual ratings
Larry
A linear least squares fit gives the following:
Pan Atlantic Score = -53.6 x ShogiClub24 - 2017
Pearson product moment correlation coeficient = 0..83
There seems to be a strong periodic component to the relationship, which I
ignored.
Ross
The following is a listing of all ratings of players rated on both the
Pan-Atlantic and ShogiClub24 rating systems fulfilling the criteria given
below. Of course, only those players whose identities on ShogiClub24 are
known to me could be included. The first column is Pan-Atlantic, second is
ShogiClub24.
2422 2284
2285 1993
2255 2013
2195 1753
2174 1925
2118 1455
2101 1465
2094 1555
2074 1064
2044 1181
2012 1453
1980 1513
1926 1378
1924 1124
1908 1161
1852 1377
1809 1298
1784 993
1769 1149
All players listed have at least 80 games on ShogiDojo, which reduces
the effect of starting rating to under 5%. All players listed have at
least 30 games on Pan-Atlantic, where starting rating plays only a tiny
role and is in any case based on known rank. Player must be listed on 2002
or 2003 Pan-Atlantic rating list. No names are given in case some players
prefer anonymity.
There are 19 players on this list. The average spread is 557.5
points, more than I expected. We need to do a linear regression on the
above numbers. If anyone can perform this for us easily, we would
appreciate it, so I don't have to rack my brain trying to remember how to
do it on my calculator or how to work downloadable software.
Larry Kaufman