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Old Apr 2nd, 2011, 12:51 PM   #1
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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.
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Old Apr 2nd, 2011, 01:02 PM   #2
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Re: Rankings 1997-2010

Here are the top 20 for 2010:

Code:
Rankings	Name	Ratings
1	Kim Clijsters	10000.00
2	Justine Henin	7728.68
3	Venus Williams	7469.70
4	Serena Williams	7146.52
5	Caroline Wozniacki	5452.83
6	Vera Zvonareva	5019.36
7	Victoria Azarenka	4451.69
8	Maria Sharapova	3803.48
9	Elena Dementieva	3631.10
10	Samantha Stosur	3529.95
11	Agnieszka Radwanska	3231.98
12	Ana Ivanovic	3098.97
13	Shahar Peer	3018.40
14	Flavia Pennetta	2900.71
15	Francesca Schiavone	2825.50
16	Nadia Petrova	2778.42
17	Na Li	2661.21
18	Anastasia Pavlyuchenkova	2549.73
19	Jelena Jankovic	2490.13
20	Marion Bartoli	2379.42
And for 2009:

Code:
Rankings	Name	Ratings
1	Kim Clijsters	10000
2	Serena Williams	9353.073779
3	Victoria Azarenka	7623.12502
4	Elena Dementieva	7388.997292
5	Dinara Safina	7017.735051
6	Svetlana Kuznetsova	6369.892055
7	Venus Williams	6168.073563
8	Caroline Wozniacki	6022.990949
9	Vera Zvonareva	5297.831958
10	Maria Sharapova	5171.447102
11	Na Li	4883.921765
12	Jelena Jankovic	4830.408765
13	Samantha Stosur	4698.144889
14	Amelie Mauresmo	4540.353561
15	Agnieszka Radwanska	4454.093474
16	Flavia Pennetta	4396.003507
17	Marion Bartoli	4198.130848
18	Sabine Lisicki	3717.103007
19	Yanina Wickmayer	3514.696451
20	Ana Ivanovic	3360.140884
And for 2008:

Code:
Rankings	Name	Ratings
1	Serena Williams	10000
2	Venus Williams	7996.822062
3	Maria Sharapova	7819.893819
4	Lindsay Davenport	6556.04884
5	Jelena Jankovic	6341.719815
6	Elena Dementieva	5906.19409
7	Justine Henin	5305.754912
8	Dinara Safina	5090.794244
9	Ana Ivanovic	5055.215379
10	Vera Zvonareva	4355.441802
11	Svetlana Kuznetsova	4215.540599
12	Caroline Wozniacki	3782.000484
13	Agnieszka Radwanska	3473.983212
14	Victoria Azarenka	3408.61248
15	Na Li	2888.755334
16	Flavia Pennetta	2868.897122
17	Dominika Cibulkova	2839.251412
18	Katarina Srebotnik	2836.738793
19	Jie Zheng	2830.072412
20	Nadia Petrova	2780.756769

And finally for 2007:

Code:
Rankings	Name	Ratings
1	Justine Henin	10000
2	Serena Williams	4308.250254
3	Venus Williams	3704.984934
4	Kim Clijsters	3579.267153
5	Jelena Jankovic	3540.429966
6	Maria Sharapova	3486.055766
7	Ana Ivanovic	2941.46069
8	Nicole Vaidisova	2854.73339
9	Tatiana Golovin	2791.310683
10	Svetlana Kuznetsova	2786.851289
11	Anna Chakvetadze	2646.468605
12	Vera Zvonareva	2357.282508
13	Nadia Petrova	2285.647741
14	Amelie Mauresmo	2101.029373
15	Agnes Szavay	2084.038476
16	Victoria Azarenka	1784.192024
17	Shahar Peer	1768.340122
18	Daniela Hantuchova	1725.025474
19	Elena Dementieva	1668.1154
20	Patty Schnyder	1644.201416
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