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post #46 of 410 (permalink) Old 03-19-2013, 10:25 PM Thread Starter
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Re: Alternative player ranking system

Unfortunately, I have discovered a bug in my database for some time now (nearly a month), which I believed affected some isolated records. But, working on a correction I found out many more erroneous records, which, due to the heavy interdependence of past results to current calculations in Elo system, renders almost the entire ranking incorrect.

I am working intensively on a solution, so hopefully an update after Miami will be error free.
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post #47 of 410 (permalink) Old 03-26-2013, 12:15 PM Thread Starter
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Re: Alternative player ranking system

An interesting fact appeared in yesterday's R16 match Berdych vs. Falla in my Elo points calculation, since I take into account every set individually. Due to the difference in points of nearly 200 between the 2, Falla earned 6 points in his defeat, exactly the same as Berdych in victory, for taking 1 set off of Berdych.
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post #48 of 410 (permalink) Old 03-26-2013, 12:23 PM Thread Starter
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Re: Alternative player ranking system

Quote:
Originally Posted by G.100sic View Post
Unfortunately, I have discovered a bug in my database for some time now (nearly a month), which I believed affected some isolated records. But, working on a correction I found out many more erroneous records, which, due to the heavy interdependence of past results to current calculations in Elo system, renders almost the entire ranking incorrect.
...
BTW, errors in the database are corrected. A relatively small number of erroneous records early on in the table propagated through calculations to almost every player's record towards the end. I may post the corrected results for week 11 update later in the evening.

It was interesting to see how larger differences from the beginning even out towards the end of the recalculation during iteration. It is actually the feature of Elo ranking system. For some players though, where error produced the largest differences, there was a significant change in positions.

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post #49 of 410 (permalink) Old 03-27-2013, 12:08 AM Thread Starter
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Re: Alternative player ranking system

Hopefully this is now error free...
Alternative player ranking system
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post #50 of 410 (permalink) Old 04-01-2013, 10:35 PM Thread Starter
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Re: Alternative player ranking system

After Miami, Murray went up 4 places, to take the second position from Ferrer...
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post #51 of 410 (permalink) Old 04-08-2013, 11:35 PM Thread Starter
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Re: Alternative player ranking system

Davis Cup ties bring some changes to the top, but Novak even more firmly on #1, with almost 60 points advantage.
Big movers upwards Tsonga and Raonic.
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post #52 of 410 (permalink) Old 04-15-2013, 11:05 PM Thread Starter
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Re: Alternative player ranking system

Thanks to his win in Casablanka, Robredo moved up 102 positions!
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post #53 of 410 (permalink) Old 04-21-2013, 09:24 PM Thread Starter
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Re: Alternative player ranking system

After Monte-carlo win, Novak has almost 100 points advantage from Ferrer, who is again at the second place.
Federer dropped out of top 10.
Nadal swapped places with Berdych, and is now 5th.
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post #54 of 410 (permalink) Old 04-28-2013, 11:02 PM Thread Starter
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Re: Alternative player ranking system

Here is week 17 update:
Alternative player ranking system

Rafa Nadal have already made it to second position! There is still quite substantial difference to Novak, Nadal is trailing by over 70 points.
Rosol shot up 27 positions, thanks to his win in Bucharest (and congratulations on his first ATP title), to the 23rd place.
Robredo is improving rapidly after the sluggish start of the season, and is now at the 25th place.
So far Cipolla and Mathieu have had absolutely catastrophic start of the season, and are trailing the list. Verdasco not far from the bottom also.
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post #55 of 410 (permalink) Old 05-05-2013, 05:55 PM Thread Starter
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Re: Alternative player ranking system

Week 18 bring little change to the Top 10, Ferrer and Murray swich places again, and Wawrinka moves up 3 positions.
Ferrer could have made it even to second place, had he won the tournament.
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post #56 of 410 (permalink) Old 05-06-2013, 03:20 PM Thread Starter
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Re: Alternative player ranking system

New comparison to the official ATP race ranking:
Code:
“Race”                       ATP race    
rank   Player                rank     Diff
  1    Novak Djokovic           1        0
  2    Rafael Nadal             2        0
  3    David Ferrer             4        1
  4    Andy Murray              3       -1
  5    Jo-Wilfried Tsonga       7        2
  6    Stanislas Wawrinka      12        6
  7    Richard Gasquet          8        1
  8    Tomas Berdych            5       -3
  9    Milos Raonic            13        4
 10    Juan Martin Del Potro    6       -4
 11    Nicolas Almagro          9       -2
 12    Roger Federer           10       -2
 13    Tommy Haas              11       -2
 14    Marin Cilic             16        2
 15    Kevin Anderson          17        2
 16    Fabio Fognini           18        2
 17    Ernests Gulbis          27       10
 18    Bernard Tomic           35       17
 19    Sam Querrey             22        3
 20    Jarkko Nieminen         24        4
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post #57 of 410 (permalink) Old 05-12-2013, 08:01 PM Thread Starter
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Re: Alternative player ranking system

Madrid update is ready:
Alternative player ranking system

Movers of the week:
However impressive was Andujar's jump of 86 places, even more impressive was Verdasco's escape from the bottom, going up 141 positions! It still wasn't enough for him to break into top 100, though.
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post #58 of 410 (permalink) Old 05-18-2013, 01:04 PM
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Re: Alternative player ranking system

Thanks for your effort, very good thread
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post #59 of 410 (permalink) Old 05-19-2013, 07:11 PM Thread Starter
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Re: Alternative player ranking system

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Originally Posted by VamosRafaNadal View Post
Thanks for your effort, very good thread
Thanks
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post #60 of 410 (permalink) Old 05-19-2013, 07:17 PM Thread Starter
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Re: Alternative player ranking system

Following his win in Rome, Nadal overtook 1st place from Djokovic in Elo race ranking.
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