Is LeBron a Bayesian?

Polymath Tyler Cowen speculates thus:

In Cleveland [LeBron] is not actually expected to win, at least not right away.  They can play the young guys a lot and rest his legs and extend his career, while developing the quality of the overall team.  And if the mix of players somehow comes through in a year or two, he looks like a basketball genius …

Given their demographic structure and Bosh’s accruing softness, Miami is a contender only if it pushes LeBron very hard and thus shortens his career. I speculate that he was very upset that he was pushed and played so hard all year long, to rest Wade, only to develop those disabling leg cramps at the end of game one against San Antonio in the Finals, which caused him to lose face.

I haven’t seen other analyses take career length into account. LeBron is entering his thirties and watching the physical implosion of Kobe Bryant, one of his role models … He sees Wade — one of his best buddies — a broken player at age 32. Why not choose the outcome that might give him a few extra years of both salary and fun?

In other words, LeBron James updates his priors … In particular, he wants to avoid the fate of Dwyane Wade, a super-talented baller who, alas, now appears to be past his athletic-performance prime. (Wade is just 32 yrs old; LeBron, 29.) By signing with Cleveland, LeBron might be able to improve his image/reputation AND extend his playing career.

P.S. Happy Bastille Day!

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!Viva Bayes!

Hey, why are there so many Bayesians in Mexico this week? Maybe it’s because the International Society for Bayesian Analysis (ISBA) is holding an international conference on Bayesian methods (see logo below) at the Cancun Conference Center in beautiful Cancun, Mexico. [*]

By the way, if you happen to be in town, we highly recommend this half-day course on Bayesian Analysis of Stochastic Process Models (scheduled for Monday, July 14). As always, please enjoy responsibly. [*] Note to our friends at WordPress: how do we do Spanish accents and symbols on the WordPress platform?

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B+ or A-?

How would you grade LeBron’s eloquent essay? More importantly, what criteria would you use in assigning your grade (e.g., style, substance, grammar, spelling, etc.), and what weights would you assign to each criterion? (Props to Clickhole.)

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What are the unofficial rules of the Tour de France?

And, more importantly, who enforces them?  Craig Fry and Dennis Hemphill discuss the unofficial rules of the Tour de France here. William Fotheringham, ditto, here. You can find a concise summary of the unwritten rules of cycling here.

Does this book include the unwritten rules as well?

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Do free agents play game theory?

Who will sign first? Melo, Lebron, or Bosh? In game-theory terms, what type of “game” are these free agents playing: Prisoner’s Dilemma, Chicken, Stag Hunt, or Battle of the Sexes?

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* A question for Nate Silver

mccann-gamestowatch-7.8

* Should Silver stop trying to predict sporting events and just stick to politics? Update your priors here and especially here.

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We saw a Black Swan today!

Nate Silver — yes, that Nate Silver, who had predicted Brasil to win the World Cup (see diagram in the post above, courtesy of FiveThirtyEight) — compares his complex (and, dare we say, opaque) statistical methods, like the Soccer Power Index and “Elo ratings,” with simple betting markets in his humble-pie post titled “The most shocking result in World Cup history.” Here is an excerpt (emphasis ours):

The Soccer Power Index (SPI) match-predictor (which uses a poisson distribution to estimate the range of possible scores) gave Germany only a 0.022 percent probability (about one chance in 4,500) of scoring seven or more goals …

Although we don’t have SPI ratings before 2006, we can look at the Elo ratings, which are heavily correlated with SPI and contain data back to the 19th century. The Elo ratings (which we’ve updated manually since the start of the World Cup) had Brasil as a 65 percent favorite before Tuesday’s match, with most of that based on its (supposed) home-field advantage …

Betting markets, which had the game at even odds going in, look a lot better than SPI and Elo in this instance. But there was almost certainly some bad luck for Brasil. [The Brasilians] had more shots than Germany in the match — I would never have guessed that while watching the game — and kept possession of the ball slightly more than half the time. Some of the goals that Brazil keeper Julio Cesar allowed were unavoidable, but he was not exactly Tim Howard in net …

In other words, prediction markets are great, but no one can predict a “Black Swan” like the lopsided outcome of yesterday’s Brasil-Germany match. By the way, what do you think about Silver’s observations about the role of luck? Wouldn’t you expect “luck” (bad and good) to be distributed randomly on both teams during the duration of the match? Also, should FIFA consider a forfeit rule?

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Memo to Murrieta

Nous somme tous américains …

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Just deserts for Brasil?

Are the Brasilians themselves mostly responsible for Neymar’s horrible on-the-field injury during their quarter-final match with Team Colombia on 4 July? Before you say “no,” check out this excellent analysis by Sam Borden recounting the sordid details of Brasil’s dirty tactics as well as the one-sided officiating during the Brasil-Colombia match. Here is an extended excerpt of Mr Borden’s thoughtful essay:

So what happened to Neymar? How did the face of this tournament end up in a hospital? Brazilian fans will not like to hear it, but while [Juan Camilo] Zúñiga was directly responsible for causing Neymar’s injury, Neymar’s teammates — specifically Fernandinho, though there were others — as well as the referee, Carlos Velasco Carballo, deserve their share of the blame, too. They did not commit the crime, but they contributed to an environment of lawlessness that led to Neymar’s being battered …

… from the first minute it appeared that Brazil was determined to play the game cynically, tripping and pushing and kicking at Colombia’s players, especially James Rodríguez, the team’s wunderkind scorer. Colombia, on the other hand, seemed almost deferential at first. When Neymar went off on a spirited run six minutes into the game, the Colombian defenders did little to try to knock him off stride, let alone scythe him to the ground as previous opponents had done. He ran freely.

When Rodríguez went to claim the ball a few minutes later, however, Brazil’s Óscar ran right into Rodríguez’s back as if to make clear to him that no space on the Fortaleza field would be a safe space. Rodríguez’s teammates were understandably upset, but there was no retaliation — the feeling of violence in the game, especially early on, came almost exclusively from Brazil …

It was in the 57th minute, though, when the match began to boil over. The Colombians had continued to mostly sit back and take the punishment, but they were clearly infuriated when Silva crushed Ramos from behind as he went toward a ball. Velasco Carballo, again, declined to whistle a foul. The Colombians’ ire was raised even more 10 minutes later when the referee showed a yellow card to Rodríguez — who was apoplectic at the decision — for an innocuous trip that was, as Rodríguez vociferously pointed out with multiple hand gestures, a first offense compared with Fernandinho’s harrying.

In other words, a rough-and-ready form of retribution (some might say “justice”) was finally meted out to the Brasilians in the 87th minute of the match, who got what they deserved, don’t you think?

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William Faulkner Reviews Ernest Hemingway’s The Old Man and The Sea

We are re-blogging this post since “The Old Man and the Sea” is one of our favorite novels of all time. (Isn’t it really a novella or “short story,” though?) By the way, do you agree with Faulkner (see below) that Old Man is Hemingway’s best work? In literature and the arts, how does one decide (beyond one’s subjective personal opinion) what the “best” is?

Biblioklept's avatarBiblioklept

His best. Time may show it to be the best single piece of any of us, I mean his and my contemporaries. This time, he discovered God, a Creator. Until now, his men and women had made themselves, shaped themselves out of their own clay; their victories and defeats were at the hands of each other, just to prove to themselves or one another how tough they could be. But this time, he wrote about pity: about something somewhere that made them all: the old man who had to catch the fish and then lose it, the fish that had to be caught and then lost, the sharks which had to rob the old man of his fish; made them all and loved them all and pitied them all. It’s all right. Praise God that whatever made and loves and pities Hemingway and me kept him from touching it any…

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