Tennis版 - USTA Ratings and How the System Works |
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P******9
发帖数: 183 | 1 很好的文章，解释的很清楚。
很多球友问评级，或者用NTRP guide line自评的时候，实际上就是文中所说的USTA以
前使用的rating system, 是Skill based.
当你参加USTA联赛之后，你拥有的评级，就是目前使用的performance based system。
我们经常把skill 和 performance混淆。
Link: http://besttennislinks.com/USTA%20Ratings%20and%20How%20the%20System%20Works.htm
全文： Someone told me they didn't want to play with someone because
they were worried about losing and it impacting their rating. I can relate
to that because I used to think like that too. Most people really don't
need to worry about their rating. It's like a college degree, if people don
't know you then its the information that gets you a job or for tennis it
gets you on a team. Once you start playing USTA tennis you create a playing
record that becomes public on TennisLink and your performance is more
important than yoCompetitive USTA League tennis playerur rating. The one
place where your rating becomes worth worrying about is when it forces you
to move up to the next rating level when you would rather not leave the team
that you currently playing on. Moving down a level isn't a problem because
you can always play up.
Improvement is what you should be focused on and your rating will
reflect that. Understanding how the rating system works is interesting and
if your goal is to "game" the system and keep your rating down then that's a
lot easier than trying to increase your rating up past your true playing
level.
What I just learned that I found really interesting is that the USTA
rating system used to be a skills based system. The first time I got a
rating (years ago) I paid $20 for a pro to watch me play with other players
attempting to get rated to the same level. Back then I asked for a 4.0
rating and based on how I looked playing on a court with some other guys
wanting the same rating he decided that I could fit in with that group. Our
area was always losing at the national level league championships so since
then they have lowered most people's ratings to help our area win more (it
has worked). A visual rating system looking at your skills always helps
those
people with good looking strokes.
The USTA a few years ago switched over to a performance based system
using TennisLink as their database. Now a computer adjusts your rating
every time you play a tennis match. You have two kinds of ratings: Year End
Rating and Dynamic Rating. The USTA publishes
your YER once a year sometime before January. They only tell you your
rating to the nearest 1USTA rating system/2 of a rating point (3.0, 3.5, 4.0
, etc.). That tells you what level you can play at. The USTA also keeps
track of a dynamic rating for you that goes to the hundreds decimal place.
They keep dynamic ratings a secret because they worry if you could see that
much detail and using your match results you could figure out exactly how
they calculate ratings. Knowing that people could then find it easier to "
game the system". There are a lot of people (I'm one) that would rather
play down and play on a strong 3.0 team and get to play in national
championship matches than to move up and play as a weak 3.5 player.
The USTA wants stable leagues. If ratings changed too often it would
make it hard on both players and team captains to plan ahead. The USTA
wants ratings to change slowly and they don't want a system that has players
moving back and forth between ratings. So as far as how
fast your rating will move up or down think of two kinds of players. New
self-rated players and everyone else who's been playing for over a year and
already have a TennisLink record. Self-rated players need to find their true
rating and so their ratings are allowed to change
much faster than the normal computer rated player.
One thing that most players don't know is that the USTA rating system
doesn't care if you win or lose. The system only wants to know how well you
performed so it looks at your game win/lost ratio. You can lose a match
and have your rating go up by winning more games
than you lost. Example: you lose the first set in a tiebreaker 6-7, then
you win the second set 6-0, and loose the 3rd set in another 6-7 tiebreaker.
You won 18 games and your opponents only won 14 games. Your team captain
isn't happy, but your rating goes up! A lost match in this case is really a
big win as far as your rating goes.
The rating change is a zero sum calculation. Let say the winning
players get .05 rating points added to their ratings. The losing team then
has to lost those .05 points so that the rating system stays in balance. In
doubles both players get or losUSTA rated tennis league playere the same
number of points. Even when one player is much stronger than his partner
they share equally in the win or lost.
Another really important thing that you should know about is that the
system doesn't want to change your rating if the outcome is what would
normally be expected. If you're a 4.0 player and you kill a 3.0 player 6-0,
6-0. Then your rating doesn't change because you only
performed as expected. If you have a dynamic rating of 3.35 and you beat a
3.12 player 6-4, 6-4 then again even though you won the match and won more
games, ratings are not changed because the result was expected. You have to
perform better than expected to improve your
rating. There are two ways to do this. Either beat people with the nearly
the same rating by a big difference in score. Or beat players that you
shouldn't beat because they have ratings that are much higher than yours.
So now you can see why a person with a 10-0 record may not move up to
next rating level. Let's say I play on court 1. I have very close matches
against players with the same rating and I kill really weak players I win
all 10 of my matches. Some are so close they are really ties. In the
matches where I kill weak players I only do what was expected. My playing
record looks great, but my playing performance isn't good enough to change
my rating.
So the quickest way to increase your rating is both to win more games
than you lose and to do it against players rated higher than you are.
Again the only way anyone increases their rating is to play better than
expected. In doubles lets say the other team's players play right at the
level expected for their dynamic ratings. It doesn't matter whether you win
or lose, or whether your partner is the strongest player on the
court or the weakest. For your rating to move up what matters is that you
or your partner has to play better than your expected playing level.
If you want to win matches then just alway pick the strongest partner
you can find, but if yNow has a correct USTA ratingou want to increase your
rating then a weaker partner will help you do that faster.
If you lose a match with a weaker partner it's not good for the ego or
for the team record, but don't assume that your rating will be impacted.
Let's say you play with a partner who's rating is not correct, either
too high or too low. Then you can bet that he's not going to play at his
dynamic rating level and your match will reflect a result that will help
correct his rating up or down (affecting your rating too.)
Most people's games are not changing very much so very few players
should expect their ratings to change. When I think about the people I know
that had their ratings increased it was because they came into the system
at the wrong level and they were moved up to the correct level.
You should also know that they don't have different ratings for singles
and doubles. So one way to "game" the system is if you are a poor singles
player then you can play that for a season to hold back your rating if you
are a much better doubles player.
If you play same gender tennis (men's or women's) then the USTA uses
those results only in your rating so your mixed doubles results don't count
. If you ONLY play mixed then the mixed results will be used for your
rating.
Also note that even though a default is listed as a 6-0, 6-0 win, it
doesn't count in rating calculations (notice that they don't list any
opponent names for you to take rating points from). | f***s
发帖数: 1582 | 2 Very interesting points..It seems that playing with weak players will not
help if one wants to move up unless he wins by big scores. | P******9
发帖数: 183 | 3 definitely, key word:ｂｅｔｔｅｒ ｔｈａｎ ｅｘｐｅｃｔｅｄ
quote: You have to perform better than expected to improve your
rating. There are two ways to do this. Either beat people with the nearly
the same rating by a big difference in score. Or beat players that you
shouldn't beat because they have ratings that are much higher than yours.
【在 f***s 的大作中提到】
: Very interesting points..It seems that playing with weak players will not
: help if one wants to move up unless he wins by big scores.
| a*m
发帖数: 6253 | 4 赞一个，谁给翻译一下就更好读了。
这个是非常务实了。。。 |
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