Moneyball Ap Statistics Assignment

Sabermetrics? No, it isn't a cross between a sword and the metric system. It's a specialized type of data analysis that uses statistics to understand the sport of baseball. And it has completely changed how people view the game. The movie Moneyball tells the story of how Oakland Athletics general manager Billy Beane used the power of statistics to gain an advantage in assembling and managing his baseball team.
In the movie, Beane is unable to re-sign Oakland's best 3 players after the 2001 season due to a limited payroll. He uses sabermetrics in an attempt to find undervalued players that can make up for the loss. He meets heavy resistance from his scouts, who argue that their years of baseball experience and knowledge mean far more than any statistic. Beane ignores their objections and builds the team his way.

The 2002 Oakland Athletics did not start the season on a good note. At one point they had a record of 20-26, good for last place in the AL West. In the movie, Beane claims this was due to a small sample size and was not proof that his system didn't work. Let's see if Minitab agrees! I'll use a 1 Proportion test to see if the A's record of 20-26 (winning percentage of 0.435) is significantly different than their record at the end of the year (winning percentage of .636).

The p-value is less than 0.05, meaning the two records are significantly different. It is unlikely the slow start occurred because of a small sample size. So if the team's last-place standing wasn't random, what was it?

In the movie, Beane insists on having Scott Hatteberg play first base instead of Carlos Pena because he thinks Hatteberg is more likely to get on base.* Beane also gets upset with Jeremy Giambi's clubhouse antics. Pena and Giambi were traded at the end of May, when the A's record was 20-26. Oakland went 83-33 the rest of the season. By the looks of it, these trades helped!

During that run of 83-33, Oakland set an AL record of 20 consecutive wins. What were the odds of that? Oakland finished the season with a winning percentage of 0.636, so to find the answer I could multiply 0.636 by itself 20 times....ooooooooor I could be lazy and have Minitab do it. I'm going to go with lazy.

Note: In order to meet the assumption of the binomial distribution, I'm going to assume the probability of Oakland winning each game was a constant 0.636. The answer won't be exact, but it'll be close enough for our purposes.

So the answer is 0.0001173, or about 8,525 to 1! Eat your heart out Red Sox!

At the end of the regular season, the Oakland Athletics tied the New York Yankees for the most wins in major league baseball. They did this despite having a payroll $84 million less than the Yankees. But that wasn't all that mattered to Beane. Toward the end of the movie, he states that he really wants his method to matter. He wants it to make a difference in the game of baseball. And has it ever! Ten years ago, if you uttered the sentence "Just look at his VORP, it's through the roof!" people would have probably thought you were a Trekkie speaking Vulcan. But mention it today, and people know you're a baseball stats junkie (though non-baseball fans probably still think you're a Trekkie). But the fact is the power of statistics has changed the game of baseball forever.

The question now is, which game will it change next?

*This thinking was correct. In 2002 Hatteberg finished with an On Base Percentage (OBP) of .374, greater than Pena's OBP of .316.

Photo "Moneyball Movie" by pursuethepassion used under Creative Commons 2.0 license.


Fun StatisticsStatistics in the News

Oakland Athletics' first basemen Scott Hatteberg is one of the people profiled in Michael Lewis' 2003 book Moneyball. Dave Kennedy/AP Photo hide caption

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Dave Kennedy/AP Photo

Oakland Athletics' first basemen Scott Hatteberg is one of the people profiled in Michael Lewis' 2003 book Moneyball.

Dave Kennedy/AP Photo

This interview was originally broadcast on May 28, 2003. The film Moneyball, which is based on Michael Lewis' book, opens on Friday.

When Michael Lewis started researching his book, Moneyball, he had a simply question: How did the Oakland A's, a motley collection of baseball misfits and utility players with the second-lowest payroll in all of baseball, win so many games?

The answer lies, as it often does in baseball, with statistics; but in this case, a very creative and unusual use of statistical analysis on the part of the A's general manager, Billy Beane. Beane paid attention to numbers collected over the years by a group of baseball enthusiasts, including software engineers, physics professors and Wall Street analysts, numbers that most everyone else in baseball ignores. These stats enabled Beane to discern the unique talents of undervalued players no one else wanted. He then assembled and regrouped them on the field, eventually pulling together a winning team last year.


The Art of Winning an Unfair Game

by Michael Lewis

Michael Lewis followed the A's through the 2002 season. In 2003, Terry Gross spoke to Lewis at the beginning of the baseball season and asked him to talk about the prevailing wisdom that teams with the most money to spend on players win the most games.

Interview Highlights

On the success of Billy Beane

"It was a losing team when he took over in 1997, and it's gotten better every year under his stewardship. And Billy Beane came into the organization and embraced the idea that there was such a thing as new knowledge in baseball, and you could research baseball and find out interesting things about it by researching it, and that the way baseball teams were conventionally run had all sorts of inefficiencies in it that could be exploited for profit. And so you've got, essentially, one team that's living purely by its wits and making a good run of it."

On embracing statistics

"You can use statistics to sort of dig below the surface of baseball and find the hidden game, find attributes, for example, in players that are very important but not highly valued in the marketplace, and also find attributes in players that teams pay a lot for that actually aren't worth that much when it comes to victory and defeat."

On the success of first baseman Scott Hatteberg

"Scott Hatteberg had spent 10 years in the Boston Red Sox organization; four of them in the minor leagues and I guess almost six of them in the big leagues. He'd been a catcher, and the Red Sox viewed him as a catcher who, you know, wasn't a disaster as a hitter and that was because they didn't value what he did really well. What he did really well was he got on base at a rate way above the big-league average, which is the single most important thing that a player can do. And in addition—and this is a more subtle virtue in a hitter—each of his plate appearances were inordinately drawn out. He would always see more pitches per plate appearance than just about any player in the league. And he rarely swung at pitches that were out of the strike zone. Now the effect of this is to subtly wear down the opposing pitching. It's good for the team to have a team full of guys who don't swing at balls and who force the opposing pitcher to throw lots of pitches, but it's even better to have a team full of guys who get on base a lot."

"Anyway, the Oakland A's had seen these qualities in Scott Hatteberg because they measured things like the number of pitches he saw per plate appearance and they watched very closely for on-base percentage. And so they had been, for several years, praying they could some way get their hands on Scott Hatteberg. Well, Scott Hatteberg had an accident during spring training with the Boston Red Sox and ruptured a nerve in his throwing elbow, and it basically meant he couldn't feel his hand. He had to relearn how to throw the baseball. He was finished from that moment on as a catcher because you have to be able to throw as a catcher. And the Red Sox then tossed him on the scrap heap. They had no sense that he was valuable as a hitter."

"Well, Scott Hatteberg ends up becoming a free agent and no one wants him. I mean, it was actually extraordinary. He becomes a free agent, I think, it's two days before Christmas at midnight, and at 12:01, Paul DePodesta, the assistant GM of the Oakland A's is on the phone to his agent saying, `We got to have this guy.' And as his agent said, `Look, we were looking at a market where 29 teams regarded Scott as useless, and one team desperately wanted him.' So Hatteberg became the first baseman of the Oakland A's last year, and he's been terrific. He's been a subtle but extremely important offensive player, and the reason they got him is that no one else saw the value in him. And because no one else saw the value in him, he was cheap. They didn't have to pay him very much."

Michael Lewis is currently a contributing editor to Vanity Fair. Tabitha Soren hide caption

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Tabitha Soren

Michael Lewis is currently a contributing editor to Vanity Fair.

Tabitha Soren

On Billy Beane's most important rule for getting players

"The minute you feel like you have to do something, you're screwed; that you can always recover from the player you didn't sign, but you may never recover from the player that you did sign that you shouldn't have. And baseball is littered with teams that have signed punitive superstars to huge contracts who then don't pan out. And the franchises are wounded or sometimes severely crippled by the fact that they don't have any money left to go and pay other players, and they're left with this superstar who's not performing and earning $80 million. In baseball, it makes much less sense to do this than in most sports because one guy on a baseball team rarely makes that much difference. It really is a team sport. So the notion that you've got to sign this superstar or that superstar is really a little silly, and that's the first principle of Billy Beane's school of management."

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