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amirbachar
Apr 2nd, 2011, 11:51 AM
Here are the rankings from 1997-2010 (as I did for ATP):

http://simtheworld.blogspot.com/2011/04/wta-rankings-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.

amirbachar
Apr 2nd, 2011, 12:02 PM
Here are the top 20 for 2010:

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
12 Ana Ivanovic 3098.97
13 Shahar Peer 3018.40
14 Flavia Pennetta 2900.71
15 Francesca Schiavone 2825.50
17 Na Li 2661.21
18 Anastasia Pavlyuchenkova 2549.73
19 Jelena Jankovic 2490.13
20 Marion Bartoli 2379.42

And for 2009:

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
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:

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
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

And finally for 2007:

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