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Rankings Master
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Discussion Starter #162
Raw calculations of 1981 are now complete. The Top 10 (even with deviations from the original stars) is almost the same, although point count and averages are a bit off. As you got used to from previous iterations, this will be used as a template to determine the mathematical model.
 

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Discussion Starter #163 (Edited)
I've upgraded the status of 1981 with the primary result of the mathematical model, the calendar, the ranking system and ranking bonuses. You can now find the weekly rankings inside the OP and here, but note they are NOT final.

1981: (RANKING SYSTEM|RANKING BONUSES - 1981 ORIGINAL SYSTEM --- CALENDAR)
[UNCONFIRMED]
12/01/1981
19/01/1981
26/01/1981
02/02/1981
09/02/1981
16/02/1981
23/02/1981
02/03/1981
09/03/1981
16/03/1981
23/03/1981
30/03/1981
06/04/1981
13/04/1981
20/04/1981
27/04/1981
04/05/1981
11/05/1981
18/05/1981
25/05/1981
01/06/1981
08/06/1981
15/06/1981
22/06/1981
29/06/1981
06/07/1981
13/07/1981
20/07/1981
27/07/1981
03/08/1981
10/08/1981
17/08/1981
24/08/1981
31/08/1981
14/09/1981
21/09/1981
28/09/1981
05/10/1981
12/10/1981
19/10/1981
26/10/1981
02/11/1981
09/11/1981
16/11/1981
23/11/1981
30/11/1981
07/12/1981
14/12/1981
21/12/1981
28/12/1981
04/01/1982 [YEAR END RANKINGS]

Here is the current mathematical model calendar:
1981 Calendar Model

Also, you can see the category ranking of tournaments here:
Ranking of tournaments


--------------------------------------------------
And now, some observations:
- Roland Garros, Wimbledon and US Open should have received 24, 24 and 26 stars. Due to the immense difference to regular tournaments (1981 didn't even feature a 15 star regular tournament), the ATP decided to knock 4 stars out of each of them to 20, 20, 22. AO stayed at 20 stars.
- The usual difference of stars exist between some tournaments and what they should have had. The ATP still practiced the star penalty unknown rule, despite it not being mentioned anywhere, especially for summer American tournaments, but also for Las Vegas (first time in 1981) and for Barcelona.
- There were no rankings released on September 7, 1981. The reason is that US Open 1980 would have dropped down then, causing severe inconsistency. The ATP decided to hold off rankings in which Grand Slam points drop off in advance of new Grand Slam points being added.
- 1981 is the first year of Computer Rankings in which the ATP (yes you're gonna see this well) DID NOT MAKE ANY OPERATIONAL ERROR WITHIN THE TOP 20! Yes, this is the closest Top 20 to the official rankings I have ever got, the only differences being those caused by Bonus Point inconsistencies.

More to follow soon. Stay tuned.
 

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Great stuff :yeah:

I see my assumption that Connors' top-3 streak was interrupted in the autumn of 1981 is supported by the preliminary numbers, even if him being ranked 4 lasted shorter than I thought.
 

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Discussion Starter #165
Yeah, Cincinnati seems to be the moment Connors lost the spot for a bit of time to Lendl. Although, you need to wait a bit more until stars are final, as things may change.

For instance, at first, on the preliminary run, I was not getting McEnroe number 1 on August 3. On the first iteration of the math model though, when the Top 15 was being synced, McEnroe was grabbing the position by one point ahead of Borg. Now, after the Top 20 is synced, Mac gets it by only 0.033. I'm curious of the jeopardy the position will be in when the Top 30 is synced.
 

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I have already checked the impact on my "most weeks ranked in" file.

Interestingly, if this holds up, Connors will pass Lendl for most weeks in the top-2 to go into 3rd only behind Federer and Nadal.
 

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Discussion Starter #167
You can see things are gonna change when you look right under Top 20. Amritraj, Pfister and Solomon are pretty far away from the number of points they officially had. But that's gonna shake an important record if Connors falls on 4th.
 

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Hi Marian,

I looked through your provisory calendar for 1981 and have a few comments.
1) Are you sure the prize money of Denver was indeed 175000 USD?
This site has only 125000 USD:
1981 Grand Prix Calendar and Results
This could explain the discrepancy between the number of stars you deduced and the official star category (undercategorization). However, with a 125000 USD prize money the number of stars would have to be decreased by two, meaning the ATP overcategorized the event.
2) The GP status of Guaruja/Sao Paulo and Lagos at the start of the year is questionable. Based on their prize money they could indeed belong to the regular tour, but the ATP counts them as challengers for some reason.
3) Kitzbuhel in July seems to have a 48 draw, but you only have it as a 32-draw event, which influences its star category.
4) You probably have the date of the Zell Am See challenger wrong, it was played at the end of July.
 

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Discussion Starter #169
Hi Elegos, thanks for the input.

1) The prize money I have from a document of the time states 175K, I don't know where that site has it, but if there is an error there, the math model will detect it, by decreasing the number of stars for it. So, patience here.
2) There have been other errors on the ATP website, this wouldn't be the first time. A challenger event of 75K is highly unlikely for 1981, and the document I have it states it was GP.
3) Typing error there. Gonna correct it in the calendar.
4) That was tricky. Yes, the ATP states it there, but some players couldn't possibly have been in Europe and in America at the same time. Check Ricardo Acuna, who supposedly plays South Orange. I moved it temporarily to 01-06-1981, so that I get all points counted, but fact is, I don't know when this tournament was played yet. Or that the draw is correct for South Orange or this either. Acuna did play in Europe before South Orange.
 

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Hi Slasher. How are you? Cna you explain me a little more about the rankings. For example I have been watching the 1975.

From the ATP site Vilas played 23 tournaments Connors 19 and Borg 21. Where tournamente you didnt count and why? The bonuses give for a win against a player whit high ranking? And finally, the Master Cup and WCT champ didnt get points for the ATP ranking?

Thanks a lot
 

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Discussion Starter #171
Sure. You can look through the OP for a lot of details. For instance, there is a calendar for each year, you can see all tournaments which counted for 1975 there. Masters Cup and WCT Finals are not among those which counted. The why is various for diverse years, but it is important to note that a tournament had to petition the ATP in order for it to be included in the rankings. Except for the finals, the reason there is that they were group based, but also because the draw was 8 players.

Bonus points and the exact rankings systems are right there along with the calendar. The header of each year looks like this:
1975: (RANKING SYSTEM|RANKING BONUSES - 1975 ORIGINAL SYSTEM --- CALENDAR)
[CONFIRMED]

Perhaps, the bonus points are harder to read. The column type suggests the type of bonus points given. "R" suggests rankings bonus, beating top players. "S" suggests seeding bonus, beating seeded players. The "S" is alongside a number suggesting the number of seeds on a draw: 4, 8, 12 or 16. Then you have MIN, which means the start of the interval, and MAX the end of the interval. For instance R-1-8 would mean bonus points for beating a ranked player between #1 and #8. Or S16-1-4 would mean bonus points for beating a seeded player between (1) and (4) on a 16 seed draw. The final column AMT is the number of points being received.
 

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Rankings Master
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Discussion Starter #172
I've upgraded the status of 1981 with the primary result of the mathematical model, the calendar, the ranking system and ranking bonuses. You can now find the weekly rankings inside the OP and here, but note they are NOT final.

1981: (RANKING SYSTEM|RANKING BONUSES - 1981 ORIGINAL SYSTEM --- CALENDAR)
[UNCONFIRMED]
12/01/1981
19/01/1981
26/01/1981
02/02/1981
09/02/1981
16/02/1981
23/02/1981
02/03/1981
09/03/1981
16/03/1981
23/03/1981
30/03/1981
06/04/1981
13/04/1981
20/04/1981
27/04/1981
04/05/1981
11/05/1981
18/05/1981
25/05/1981
01/06/1981
08/06/1981
15/06/1981
22/06/1981
29/06/1981
06/07/1981
13/07/1981
20/07/1981
27/07/1981
03/08/1981
10/08/1981
17/08/1981
24/08/1981
31/08/1981
14/09/1981
21/09/1981
28/09/1981
05/10/1981
12/10/1981
19/10/1981
26/10/1981
02/11/1981
09/11/1981
16/11/1981
23/11/1981
30/11/1981
07/12/1981
14/12/1981
21/12/1981
28/12/1981
04/01/1982 [YEAR END RANKINGS]

Here is the current mathematical model calendar:
1981 Calendar Model

Also, you can see the category ranking of tournaments here:
Ranking of tournaments


--------------------------------------------------
And now, some observations:
- Roland Garros, Wimbledon and US Open should have received 24, 24 and 26 stars. Due to the immense difference to regular tournaments (1981 didn't even feature a 15 star regular tournament), the ATP decided to knock 4 stars out of each of them to 20, 20, 22. AO stayed at 20 stars.
- The usual difference of stars exist between some tournaments and what they should have had. The ATP still practiced the star penalty unknown rule, despite it not being mentioned anywhere, especially for summer American tournaments, but also for Las Vegas (first time in 1981) and for Barcelona.
- There were no rankings released on September 7, 1981. The reason is that US Open 1980 would have dropped down then, causing severe inconsistency. The ATP decided to hold off rankings in which Grand Slam points drop off in advance of new Grand Slam points being added.
- 1981 is the first year of Computer Rankings in which the ATP (yes you're gonna see this well) DID NOT MAKE ANY OPERATIONAL ERROR WITHIN THE TOP 20! Yes, this is the closest Top 20 to the official rankings I have ever got, the only differences being those caused by Bonus Point inconsistencies.

More to follow soon. Stay tuned.
Update made to the mathematical model, it will now be closer to the actual system.
 

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Thanks Salsher. Perfect. I have other doubts but I will ask yoy later if isn't a problem for you.
 

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Hi Slasher,
I don't have access to the ranking system for some reason.
Will you be able to upload them to some other site perhaps?
Thanks,
Amir
Same problem for me : I can't acces to RANKING SYSTEM and RANKING BONUSES for 1979, 1980 and 1981. Same thing with chrome and IE. :crying:

All other datas are available in Slasher's livefilestore or onedrive.live. :grin2:

Is it possible that someone upload these files elsewhere ? Thank you in advance. :worship:
 

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Rankings Master
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Discussion Starter #176 (Edited)
Thanks Salsher. Perfect. I have other doubts but I will ask yoy later if isn't a problem for you.
You can ask whenever you like.:wink2:

Hi Slasher,
I don't have access to the ranking system for some reason.
Will you be able to upload them to some other site perhaps?
Thanks,
Amir
Same problem for me : I can't acces to RANKING SYSTEM and RANKING BONUSES for 1979, 1980 and 1981. Same thing with chrome and IE. :crying:

All other datas are available in Slasher's livefilestore or onedrive.live. :grin2:

Is it possible that someone upload these files elsewhere ? Thank you in advance. :worship:
This is onedrive's problem. I recommend to the whole world to never use onedrive for image upload ever again. They don't memorize the links of pictures for more than 24 hours now. I will put all of these files on dropbox and update the OP.

EDIT: OP Updated.
 

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Rankings Master
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Discussion Starter #178
And for 1981, the star system is almost final. There be little to no modification to tournament categories now, as the Top 100 model fits. Satellite data is inserted for Top 100 players, so it can be seen at a semi-final state now.

The status of 1981 has been upgraded to
[CALCULATED]

and the weekly rankings can be seen as before in the links above or the OP.

Now for some interesting statistics.

It is important to note the increase in precision of the ATP rankings. Although, the model was harder to build as I advanced from 1979, the precision with which ATP adopted the star system increased. Although 1981 features the most modified calendar (stars mostly don't fit the rules), it also features the least operator errors. Here is in pictures, the increased precision of the top 30 calculations.

1979:

Perfect match: 6 (2 in Top 10)
Similar match: 15 (4 in Top 10)
Far: 1 (Panatta is actually this, despite yellow color
Errors: 8 (4 in Top 10, 5 in Top 20)

1980:

Perfect match: 7 (3 in Top 10)
Similar match: 19 (6 in Top 10)
Far: 1
Errors: 3 (1 in Top 10, 2 in Top 20)

1981:

Perfect match: 8 (3 in Top 10)
Similar match: 17 (7 in Top 10)
Far: 1
Errors: 4 (0 in Top 10, 0 in Top 20)

The ATP were making less errors in top positions by 1981, the most exposed positions being 30-50, with enough important tournaments played, but unimportant enough to fail notice.
 

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Rankings Master
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Discussion Starter #179
4) You probably have the date of the Zell Am See challenger wrong, it was played at the end of July.
Well, after more checking, I have Zell Am See played between July 27 and August 2. Which means Acuna flew to South Orange, lost in round 1, decided to return to Europe to play in Zell Am See, won two singles matches, and the doubles tournament and flew back to America to continue the swing there.

To simulate this, Acuna's participation in this Challenger will be noted as a Satellite, because, in this configuration, I can't write two live tournaments in the same week for one player.
 

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Hey @Slasher1985 I saw your sig with Laver added. It seems to me there is no comment about it in this thread at the moment so could you elaborate a bit on that? Do you have some tips on consecutive weeks?
Thanks.
 
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