作者WillWaiting ()
看板Sabermetrics
标题Re: [问题] WPA
时间Thu Oct 5 00:09:03 2006
※ 引述《Romulus (Säubern Mode)》之铭言:
: 刚刚翻网页时看到这个,有人说用WPA来看Ortiz「巨幅」领先其他人(@8/13)
: ,不只是Jeter,更包括Manny。
: 可是他内文解释的WPA理论我相当无法认同和理解,请问有人对WPA有研究的吗?
Like Win Shares, WPA is not a good predictive statistic because it's not
necessarily a good representation of a player's true talent. If a player hits
a home run in the ninth inning of a 1-0 game, he is credited with more WPA
points than if he hits a home run in the first inning of a 1-0 game. The
talent is the ability to hit the home run; when it happens in a game is
something that is pretty random. When you are thinking of acquiring a player
for your fantasy team, you should rely more on the traditional sabermetric
stats, like Linear Weights, Runs Created, DIPS, etc. etc
http://www.hardballtimes.com/main/article/the-one-about-win-probability/
另外一篇
WPA Curiosities
I logged today’s A’s-Twins game in my WPA spreadsheet and found some
curious things. Frank Thomas was voted the Game MVP (rightfully, in my
opinion), but he actually finished third on the A’s in WPA, behind Zito and
Street. Thomas’s home runs occurred in less critical situations: the second
inning, when the LI was just 0.89, and in the ninth with the A’s up 2-1 (LI
of 0.70), so the WPA of each home run was just under .10 in both cases.
There were several bigger hits in the game, including Scutaro’s double in
the second (.103) and Jason Bartlett’s double in the eighth with none out
and the Twins down by a run (.166). Also, the flyball that Milton Bradley
lost in the Metrodome roof was worth .166 WPA, too. Those were the two
biggest plays of the game.
So Frank Thomas, who homered for two of the A’s three runs, didn’t lead the
team in WPA and didn’t even have the biggest hits of the game. Go figure.
--
WPA的瑕疵还蛮多的
--
※ 发信站: 批踢踢实业坊(ptt.cc)
◆ From: 220.136.176.92
1F:→ dadaHOPE:虽然不是个很好的能力预测模型,不过对"贡献度"来说应该还 10/05 00:10
2F:→ dadaHOPE:漫直得参考的吧...就这两年的WX或WPA来看 红袜迷对Papi关 10/05 00:13
3F:→ dadaHOPE:键时刻的表现就不只是印象分数了 10/05 00:15
4F:→ WillWaiting:这里面有点问题 10/05 00:17
5F:→ WillWaiting:例如说A队某人一局上打3分炮 到九局下前A:B=3:5 10/05 00:22
6F:→ WillWaiting:但是A队某乙打了一只三分逆转再见全垒打 10/05 00:23
7F:→ WillWaiting:这时候某乙的WPA就会比某人的WPA还高高高高很多 10/05 00:23
8F:→ WillWaiting:可是没有某人的三分炮 某乙的三分炮也赚不了这麽多 10/05 00:23
9F:→ WillWaiting:看win shares跟loss shares会比较准:p 10/05 00:25