Rankings 1997-2010 - TennisForum.com
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 Apr 2nd, 2011, 11:51 AM #1 amirbachar Senior Member   Join Date: Apr 2006 Posts: 241 Rankings 1997-2010 Here are the rankings from 1997-2010 (as I did for ATP): http://simtheworld.blogspot.com/2011...1997-2010.html The methodology used: I'll use the notation A to speak about a player with current ratings A. I start by assigning arbitrary rankings for all players (let say everyone start with 1000). Then, for each set between A and B, the expectancy for A is A/(A+B). For each player we can calculate the expectancy sets won according to the sets he actually played. If the expectancy is lower than the number of sets he actually won, we increase his ratings. If the expectancy is higher than the number of sets he actually won, we decrease his ratings. That system is called KRACH. Now, to adjust it to all time tennis rankings: I assigned set factor, according to the importance of the set n the match (so final sets worth more). I assigned tournament factor, so GS for example worth more. And finally, the latest addition - for each player I ranked all the years he played in according to the sets won/expectancy (like before). For each player there is a year factor according to the rankings. I factored each match by the minimum of both players factors in that year.