n****l
发帖数: 6652 | 1 http://bbs.fishtt.hk/viewthread.php?tid=4937
美国乒乓球球员评分
我转发这个帖是想让更多球友了解美国乒乓球球员评分方法. 感觉该评分系统是比较
客观的(我参过美国乒乓球积分赛). 我认为运动员水平要有提高, 一是要知道他人水平
怎样, 更要认清自己. 有了积分, 你可冷静,客观地认识,分析问题. 发现别人和自己的
技术长,短处, 训练,比赛中扬长避短. 这不仅对业余乒乓球球员有益, 对中国乒乓球群
众化,规范化也好. 建一个该评分系统, 其实还是一个大的赢利商机. 美国评估一个积
分为每人15美元. 大家有兴趣吗? 建议小鱼儿牵头推广它. 个人见解, 欢迎拍砖.
转自SOHU论坛
作者：【小能】
[drbigqiu@sohu]
发表于2004-10-22 13:44:56
USATT 是美国乒乓球协会。在该协会注册的乒乓球俱乐部和业余球员数目众多。为了更
好地切磋和增进球技，USATT实行了积分制度，以评估选手的实力。台湾也在应用这套
记分方法。该制度不将选手的年龄性别球龄等作分类，而是统一进行评分。缺点是略显
粗糙，优点是简单易行。
选手的积分通过正式比赛的胜负，根据下表来计算。
选手积分差距 积分高者获胜 积分低者获胜
胜方加分/负方减分 胜方加分/负方减分
0 - 12 8 8
13 - 37 7 10
38 - 62 6 13
63 - 87 5 16
88 - 112 4 20
113 - 137 3 25
138 - 162 2 30
163 - 187 2 35
188 - 212 1 40
213 - 237 1 45
238或以上 0 50
所谓正式比赛，可以是地区比赛，也可以是俱乐部内部比赛。只要比赛双方都认可这场
比赛的结果用于积分的计算就可以了。当然，这样的比赛一般都是用比较正规的场地和
器材，可以没有裁判，但是在执行规则方面还是很严格的。
初次参赛，没有原始积分的选手，可由俱乐部负责人指定一名具有相似实力的老选手与
其试赛，根据结果估算其大致积分。
各水平选手USATT积分大致如下：
现役国手：2500以上
省市级代表队：2300
大专院校大型企业代表队：2000
少年代表队：1800
业余选手（高手）：1600-1800
业余选手（中手）：1400-1600
业余选手（低手）：1400以下
USATT不乏高手，虽不见得有多少2500分以上的，但是一个地区的俱乐部中，必有2300
的好手，是当地乒乓球爱好者的领头羊。每个俱乐部都至少有2000分的高手。俱乐部中
主要成员的水平集中在1600-2000。
兄弟我自认为水平不俗，但是真按照该计分方法打了几场，不过也就排了个1500分，这
个水平方在哪个俱乐部也是垫底。可见美国群众乒乓球运动的广泛的雄厚的实力。
下边是美国官方网站的解释
来自：http://www.usatt.org/ratings/ratingsprocess.html
USA Table Tennis Rating Chart
Point Spread Between Players Expected Result (Higher Rated Player
Wins: number of points exchanged) Upset Result (Lower Rated Player
Wins: number of points exchanged)
0 - 12 8 8
13 - 37 7 10
38 - 62 6 13
63 - 87 5 16
88 - 112 4 20
113 - 137 3 25
138 - 162 2 30
163 - 187 2 35
188 - 212 1 40
213 - 237 1 45
238 and up 0 50
For example if player A (rated 1814) defeats player B (rated 1800), player A
will gain 7 points (becoming 1821), and player B will lose 7 points (
becoming 1793). Players who have not played in previous USATT tournaments
will be given an initial rating based on their performance in their first
tournament. Additionally, players with exceptional gains following a given
tournament may be given an adjusted rating. In addition to rewarding the
adjusted player for his performance, this also reduces the rating losses
sustained by his opponents.
The process is performed in 4 passes. They are described below.
Pass 1 - take all rated players, and check for probable adjusted players
Start each rated player from their pre-tournament rating. For each match
against another rated player, use the ratings chart to determine the change
in rating points. If a player's rating goes down, or up by less than 51
points, their rating for pass 2 is set to their pre-tournament rating. If a
player's rating went up by 51-75 points, their rating for pass 2 was set to
their rating after pass 1. If a player's rating went up by more than 75
points (and they had at least one loss), their rating was calculated from
the following:
Pass_2_rating = ( BestWin + WorstLoss ) / 4 + ( Pass_1_result ) / 2
This is an average between their pass 1 result, and the average of the
player's BestWin (the rating of the highest rated opponent that the player
defeated) and the player's WorstLoss (the rating of the lowest rated
opponent that the player lost to).
Pass 2 - take all unrated players, and attempt to set a rating
For each unrated player, try and find an initial rating using the following
formula:
Initial_Rating = (BestWin + WorstLoss) / 2
The ratings for rated players are the Pass_2_ratings given above. No points
are given/taken away for matches against other unrated players at this point
. In addition to the rating, a rough measure of the quality of the rating is
presented using the following formula:
Confidence = 100.0 - ( (BestWin - WorstLoss) / 20.0 )
If we assume that the player's best win was against a 1640 player, and his
worst loss against a 1660 player, this sets Initial_Rating = 1650, and
Confidence = 99%. Confidence numbers below about 95% should be checked by
looking at match scores. Confidence numbers below 75% imply a 500 point
difference between BestWin and WorstLoss, and the program will simply set
Initial_Rating = 0.
A second method to get an initial rating is done through inverting a
handicap chart. For each of a player's matches, look at the scores, and
determine the handicap that would have brought the game to deuce. Then, use
the handicap table to find the rating difference that gets that handicap.
Add (if the unrated player won the match) or subtract (if he lost) that
rating difference from the opponent's pass 2 rating. This gets an estimated
rating based on that match. Repeat for all matches, then average all the
estimated ratings together.
In general, players who only play other unrated players are very difficult
to rate. Players who don't win matches are very difficult to rate. Generally
, players (especially beginners) who haveratings below 700 either quit or
improve - sooner or later, their ratings will reflect their standing amidst
the playing community. Improvements are often so quick that their beginning
ratings are nearly discarded via the adjustment system.
Pass 3 - take all players and check for required adjustments
All previously rated players start from their pre-tournament rating. Unrated
players start from their initial rating given in pass 2. For each match,
calculate the change in rating points from the standard rating chart. If a
player's rating goes up by less than 50 points, their rating for the final
pass is set to the same as their pre-tournament rating. If a player's rating
goes up by 50-75 points, their rating for the final pass is set to their
rating after pass 3. If a player's rating goes up by more than 75 points (
and they had at least one loss), their rating is calculated from the
following:
Pass_3_rating = ( BestWin + WorstLoss ) / 4 + ( Pass_3_result ) / 2
This is an average between their pass 3 result, and the average of the
player's BestWin (the rating of the highest rated opponent that the player
defeated) and the player's WorstLoss (the rating of the lowest rated
opponent that the player lost to).
Pass 4 - Final Pass
The ratings for adjusted players from round 3 (which might include formerly
unrated players), and initial ratings for unrated players (who didn't need
an adjustment) from round 2, are combined with the rest of the players who
did not need an adjustment. For each player, and each match, we go through
the rating table process. This results in the final rating.
Updating the Ratings
Following the four pass ratings system, the Ratings Coordinator should
review the ratings summary files for accuracy. These are saved to the #.IDV
and #.SUM files (replace # with the tournament ID). If no errors are noted,
then it is time to update the ratings database. This is done by pressing the
Update button on the tournament processing dialog box. | W**T
发帖数: 18996 | 2 只看一眼那个积分标准： 现役2500， 省2300就知道这要么老掉牙， 要么不靠谱， 就
翻译了一群人看完就自以为专家的那个最最科普的一段。 | n****l
发帖数: 6652 | 3 看英文那段还是比较reasonable的撒。
【在 W**T 的大作中提到】
: 只看一眼那个积分标准： 现役2500， 省2300就知道这要么老掉牙， 要么不靠谱， 就
: 翻译了一群人看完就自以为专家的那个最最科普的一段。
| f*****o
发帖数: 2526 | |
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