If you've seen, or are planning to see the film “Moneyball”, starring Brad Pitt and Jonah Hill, it's entertainment. Most of the real story can be found on Wikipedia, in the articles on A's GM Billy Beane and Assistant GM Paul DePodesta.
DePodesta was taken out of the film entirely, and replaced by the fictional character played by Hill. The film portrayed Beane as placing his career on the line with the deals he made during the 2002 season, when, in fact, he had already been the General Manager of the A's for four seasons.
The book that the film was based on was written by Michael Lewis and published in 2003. It gives a history of “sabermetrics”, a set of baseball statistics that started with Bill James, and was refined by a community of geeks. James felt that batting average, home runs, and RBI are ineffective measurements of a players performance. On-base percentage is better, but James came up with the “runs created” statistic, which is:
RC = ((hits + BB) x total bases) / (at bats + BB) |