Wander
In the Locker Room
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- Oct 22, 2022
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Thanks. Do you know how his Elo differs from UTS? I know his numbers are lower, but was wondering how they differed in terms of calculations. They do yield some interesting differences, for instance:
Sackmann has Agassi #1 in 1999 and Safin #1 in 2000, but UTS has Sampras #1 both years. Both have Agassi #1 in 1995.
Both have Roger #1 2003-07, and 2009-10, but Sackmann has Novak #1 in 2017 (???) and UTS has Roger #1 in 2017 (makes more sense).
In some cases I find myself agreeing more with Sackmann, others UTS.
I don't know about all the different details of the Elo formulas, but the differences between TA and UTS number values are likely caused by the so-called "k-factor" which is a value that basically determines how much a player's Elo rating can change from a single match. The two sites have probably calibrated their Elo formulas a little bit differently there.
But UTS doesn't decide who was the best player of the year based on Elo but based on how many of their "GOAT points" the player achieved that year, so basically it values big tournament wins above all, then reaching finals, semi-finals etc. and also gives some credit for weeks spent at #1 and so on.
Jeff's system is entirely based on the Elo formula which doesn't know or care about the existence of titles, doesn't give you any bonus for beating Djokovic in a Major final vs. beating him in the first round of a 250. For Elo, a match is a match and it just does a mathematical calculation of a player's season based on the string of results they recorded that year.
What makes Elo of course better and more sophisticated than just a simple match win% calculation is that it acknowledges each opponent's own Elo rating at the time the match took place. So you get a much bigger boost to your rating for beating Djokovic than you would for beating Emil Ruusuvuori. But it will sometimes work against people's intuitions of who had the best season because people like to give big titles a lot of extra credit that Elo does not care about - or let's say that Elo only cares about them if the quality of opponents was also very high.