Other sabermetric books have been written in the last few years, The Book is the best one by far. It is chock full of information, results from research and answers a lot of interesting baseball questions. The three authors, Tom Tango, Mitchel Lichtman and Andrew Dolphin have academic backgrounds and work for major league teams as employees or consultants. They use statistical methods to extract and comprehend information from a massive database of baseball games.
For the layman, there may be too much math throughout the book. However, they do a fantastic job of summarizing each idea in plain English at the end of each section. For example, in chapter 2 on hot and cold streaks, after presenting data, explaining their process and interpreting results, they summarize the section with "Knowing that a hitter has been in or is in the midset of a hot or cold streak has little predictive value. Always assume that a player will hit at his projected norm (adjusted for the park, weather, and pitcher he is facing), regardless of how he has performed in the very recent past. A player's recent history may be used as a tiebreaker."
Managers, players, fans and the media often put too much emphasis on results from small samples sizes. The authors warn against making this mistake. "One of the pervasive themes of this book is the danger of inferring too much from too little by underestimating the influence of randomness". For example, they summarize a section on pitcher-batter matchups with: "Knowing a player will face a particular opponent, and given the choice between that player's 1,500 PA (plate appearances) over the past three years against the rest of the league or twenty-five PA against that particular opponent, look at the 1,500 PA. "
They aren't afraid to point out when general baseball wisdom is correct. On starting pitchers, they write, "pitchers perform best with five days of rest, and worst with three days of rest. To manage our entire starting rotation effectively, four days of rest seems to be the optimal point. The current MLB pattern of scheduling the starting rotation works."
This book is at the top of my recommendation list for thinking baseball fans. I'm a bit surprised that I'm the first reviewer of this book on Amazon, since it has been out for three months. The sales ranking (currently #47,000 as I write this review) is disappointing for such an incredible book. The Book deserves to be at the top of the baseball best seller's list.