Apr
09
Same old story in loss to Orioles
By
| Player | WPA | pLI | Pitcher | WPA | pLI |
|---|---|---|---|---|---|
| Alex | .136 | 1.08 | Henn | .072 | 1.70 |
| Damon | .122 | 1.15 | Pettitte | .042 | 0.58 |
| Giambi | .010 | 1.41 | Myers | .029 | 0.25 |
| Jeter | -.002 | 1.16 | Vizcaino | .010 | 0.34 |
| Abreu | -.031 | 0.88 | Proctor | -.056 | 0.83 |
| Cairo | -.045 | 1.33 | Rasner | -.330 | 0.92 |
| Cano | -.051 | 1.39 | |||
| Nieves | -.059 | 1.04 | |||
| Posada | -.067 | 1.23 | |||
| Cabrera | -.134 | 1.37 | |||
| Phelps | -.145 | 1.90 |
The offense can’t be counted on to come back from deficits like this every game. The Yanks have played this game five times so far this year, and it’s only going to result in a win every so often. Hopefully, a move to a climate-controlled environment helps out.
Ben sums up the woes very well here and here. The only thing I have to add is that Melky should not be batting leadoff for any reason until he starts taking pitches — ones in the dirt don’t count.
Pavano vs. Fat Ass Ponson tonight. If we don’t pound the crap out of this guy, I’m going to be very disappointed.
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Hi Joseph, can you explain me somethig? Isn´t the home team a winner something like 54% of the time? So when the game starts, the shouldn´t the wpa start at .54?
If so, if you win a home game, the total contribution (sum of all the players wpa) should be a .46, and not a .54. If you start your calculations at .500, this means that, after the first out, you have credited the pitcher with an extra .04 he did not deserve. This mean that the contribution from the pitcher, from the wpa standpoint, has been even more abysmal.
Sorry to bother you with this, I don´t mean to nit´pick, just want to understand the concept better.
Sorry, should have said
If so, if you win a home game, the total contribution (sum of all the players wpa) should be a .46, and not a .50.
Hi Fabio. Yes, the WPA calculation is made with the home team winning 54 percent of the time. So the pitcher does not receive any undue credit. Winning home teams have a combined WPA of .460, and winning away teams have a combined WPA of .540.
Than something must be not working properly, since the sum of the wpa for this game is -.50, and the sum from the last game is .50. Also, the wpa graph starts at .50.
I’ll have to as a few questions, then. I used to run WPA through a spreadsheet, and that certainly started out with the home team at 54%. Now, I take information from another website, so I’ll have to ask him and find out a proper answer for you.
Thanks. And thank you for the trouble. You have a great site, I am enjoying reading your analysis.
Hmm…it appears my comment didn’t show up, or was lost in moderation.
Anyway, here’s the explanation. First, the 4% difference is considered negligible, since it is spread out among all position players and pitchers. It amounts to roughly .003 per player.
The most important reason, though, is that giving the home team such an advantage would open the flood gates to other variables. For instance, if Santana is on the mound for the Twins, their odds of winnings are much higher than if Sidney Ponson is pitching. Yet, there is no WPA adjustment for that. So, why give them the 4% home field advantage when other advantages are not noted?
I think when you take that into account, the 4% seems even more negligible.
You can find a discussion thread over on fangraphs:
http://www.fangraphs.com/forum.....d.php?t=68
http://www.fangraphs.com/forum......php?t=164
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