CSS Button No Image Css3Menu.com

Baseball Prospectus home
Click here to log in Click here for forgotten password Click here to subscribe
Strength of Schedule Report
<< Previous Article
Premium Article Overthinking It: Feast... (09/07)
<< Previous Column
BP Unfiltered: Economi... (09/07)
Next Column >>
BP Unfiltered: Her Guy (09/08)
Next Article >>
Premium Article The Prospectus Hit Lis... (09/07)

September 7, 2012

BP Unfiltered

Do the Dodgers Lack Chemistry?

by Colin Wyers

So, Ken Rosenthal laid down the gauntlet this morning:

WARNING: The theory that I am about to advance cannot be quantified. But in the spirit of baseball bi-partisanship, I urge the statistically inclined to read to the end, then pause 10 seconds for reflection before bombarding me with any dismissive tweets.

The theory is this: The Los Angeles Dodgers have not yet jelled, and might not jell until next season, after their players have experienced a pennant race together and bonded over a full spring.

Yes, I’m talking about chemistry. Cohesiveness. Intangibles. All of those funky things that a computer cannot measure. All of those funky things that make the sport an enduring mystery, yet drive the statistically inclined to distraction.

I can’t fall too in love with my theory, not when the Dodgers can disprove it at any moment, starting this weekend when they visit the San Francisco Giants in a pivotal NL West showdown (Saturday, MLB on FOX, 4:10 p.m. ET).

But seriously, what other explanation is there for the Greatest Lineup Ever Slapped Together producing only 20 runs in the Dodgers’ seven-game homestand against the Arizona Diamondbacks and San Diego Padres?

How else can one account for the Dodgers being only 5-7 since acquiring first baseman Adrian Gonzalez and right-hander Josh Beckett from the Boston Red Sox — after acquiring shortstop Hanley Ramirez from the Miami Marlins and left fielder Shane Victorino from the Philadelphia Phillies?

How else indeed. Lemme get out the old calculator, and we'll see how else one can account for it. Let's treat everything as an independent binomial (I really don't feel like breaking out the hypergeometric distribution for this, and it'll be close enough). And let's give the Dodgers a win probability estimate of about .583 over that time period—I'll hand out all the formulas you need here, so if you have a different estimate, please feel free to use it. To come up with the expected random standard deviation, we simply do:


Run those figures, and we get an expected random standard deviation of .142, which is to say that over a 12-game stretch, we should expect a team with a "true talent" of .583 to fall somewhere between .441 and .725 68 percent of the time. (This assumes a symmetrical margin of error, which there really isn't a good reason to expect—we should expect to see outcomes below .441 more often than we see outcomes of .720 and above. That's because we should, all things being equal, expect performance closer to the mean than farther away from it. We can model this, but for our purposes right now, we don't really have to. We're also not accounting for uncertainty in our estimate of true talent. The cumulative effect of all the things we aren't accounting for is that we're probably understating how often we should expect a 5-7 run in 12 games.)

Okay, so over that stretch, we have the Dodgers winning at a .417 clip, or at 1.17 standard deviations away from our initial estimate, so we go from about 68 percent to 75.8 percent—in other words, three quarters of the time, we should expect teams to fall that close to their true talent. So that means a quarter of the time we should expect teams to be more extreme than that. Given how many 12-game sets there are in a 162-game schedule, we should expect to see results like this several times per season. In fact, the Dodgers went 1-11 from June 19th through June 30th. Granted, that may have been an inferior edition of the Dodgers, but not so inferior that we would have projected a 12-game stretch like that. So one other way we can account for a talented team losing over a small sample is sheer randomness. And it's nearly impossible to tell them apart.

Now, attend please, sabermetricians and fellow travelers. The fact that something is indistinguishable from randomness given our data and our model does not make it random. Rosenthal closes with a remark about the "absolute certainty that the statistically inclined crave," which should be the opposite of what those of us in the sabermetric community crave. If you remember nothing else, folks, remember this: What profits a man if he pisses off Ken Rosenthal but loses his soul? We should strive to acknowledge uncertainty wherever it exists, and in this case, we are uncertain about the validity of Rosenthal's claims. (And by "strive to" I mean do it or the Krampus will eat you.)


The reason we're uncertain about Rosenthal's theory is because we lack good ways to test it. We should, of course, try to seek out those ways and actually do that. But until then, his theory is of very little utility. It doesn't help us predict what the Dodgers will do. (And let's face it, the rest of the season is not so long that a poor performance out of the Dodgers would do much in confirming it.) And because the theory seeks to explain previously observed behavior, it has the uncomfortable feeling of being a post hoc rationalization, rather than predicting something (as J. Wheatley-Schaller of Vegas Watch pointed out, the article would be much more compelling had it been written BEFORE the poor run of performance). So while Rosenthal is not necessarily wrong (saying again, absence of evidence is not evidence of absence), he's not contributing a lot of substance to the discussion with his theory, either.

Colin Wyers is an author of Baseball Prospectus. 
Click here to see Colin's other articles. You can contact Colin by clicking here

Related Content:  Dodgers,  Losing Streak,  Chemistry,  Ken Rosenthal

15 comments have been left for this article.

<< Previous Article
Premium Article Overthinking It: Feast... (09/07)
<< Previous Column
BP Unfiltered: Economi... (09/07)
Next Column >>
BP Unfiltered: Her Guy (09/08)
Next Article >>
Premium Article The Prospectus Hit Lis... (09/07)

Flu-Like Symptoms: Walk-Off Winners
Premium Article Monday Morning Ten Pack: 2018 Breakout Candi...
Prospectus Feature: Tunnels and Sequencing: ...
Premium Article Short Relief: A Long September
BP En Espanol: Tuneles y secuencias: aplicac...
Premium Article Baseball Therapy: Confessions of a Fake Mana...
Rubbing Mud: The Sinker Doesn't Play Well Wi...

Fantasy Article Value Picks: Outfielders for 9/7/12
Fantasy Article Value Picks: Starting Pitching for 9/7/12
Premium Article Collateral Damage Daily: Friday, September 7
Premium Article The Prospectus Hit List: Friday, September 7
What You Need to Know: Friday, September 7
Premium Article Overthinking It: Feasting on the East
The BP Wayback Machine: Adam Greenberg

2012-09-26 - BP Unfiltered: A Modest Point About the AL M...
2012-09-21 - Manufactured Runs: The Very Long Night of Me...
2012-09-12 - Premium Article Manufactured Runs: Searching for Fatigue in ...
2012-09-07 - BP Unfiltered: Do the Dodgers Lack Chemistry...
2012-09-05 - Premium Article Manufactured Runs: How Much Team Age Matters
2012-08-27 - BP Unfiltered: Ethier's Interference
2012-08-22 - Manufactured Runs: Is the Answer to Imperfec...

2012-09-10 - BP Unfiltered: Angels in the Outer Field Are...
2012-09-08 - BP Unfiltered: The Pitcher with a Hole in Hi...
2012-09-08 - BP Unfiltered: Her Guy
2012-09-07 - BP Unfiltered: Do the Dodgers Lack Chemistry...
2012-09-07 - BP Unfiltered: Economists Warn: All Baseball...
2012-09-06 - BP Unfiltered: Home Runs at Home
2012-09-05 - BP Unfiltered: The Correlation Between Heigh...