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COPYRIGHT 2006 All rights reserved. Reproduced by permission of The Condé Nast Publications Inc.
The first player picked in the 1996 National Basketball Association draft was a slender, six-foot guard from Georgetown University named Allen Iverson. Iverson was thrilling. He was lightning quick, and could stop and start on a dime. He would charge toward the basket, twist and turn and writhe through the arms and legs of much taller and heavier men, and somehow find a way to score. In his first season with the Philadelphia 76ers, Iverson was voted the N.B.A.'s Rookie of the Year. In every year since 2000, he has been named to the N.B.A.'s All-Star team. In the 2000-01 season, he finished first in the league in scoring and steals, led his team to the second-best record in the league, and was named, by the country's sportswriters and broadcasters, basketball's Most Valuable Player. He is currently in the midst of a four-year, seventy-seven-million-dollar contract. Almost everyone who knows basketball and who watches Iverson play thinks that he's one of the best players in the game.
But how do we know that we're watching a great player? That's an easier question to answer when it comes to, say, golf or tennis, where players compete against one another, under similar circumstances, week after week. Nobody would dispute that Roger Federer is the world's best tennis player. Baseball is a little more complicated, since it's a team sport. Still, because the game consists of a sequence of discrete, ritualized encounters between pitcher and hitter, it lends itself to statistical rankings and analysis. Most tasks that professionals perform, though, are surprisingly hard to evaluate. Suppose that we wanted to measure something in the real world, like the relative skill of New York City's heart surgeons. One obvious way...
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