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Given Moneyball credit for the stats revolution is pretty incorrect. It's more a combination of Bill James, Rob Neyer, Fantasty Baseall, The Internet and publications like Baseball Prospectus. Moneyball was written after a lot of this stuff got off the ground.
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here is short timeline of the above events (and then some)
# 1940's and 1950's - Branch Rickey hires Allan Roth as team statistician.
# 1964 - Earnshaw Cook, Percentage Baseball
# 1960's-1980's - Earl Weaver builds a three-run home run offense
# 1971 - Bob Davids founds SABR (Society for American Baseball Research)
# 1970's-1989 - Bill James, working at Van Camp pork and beans as a night watchman starts writing the Baseball Abstracts (1980-1989) (coins sabermetrics)
# 1985 - John Thorn and Pete Palmer, Hidden Game of Baseball
# 1998 or so - Billy Beane promoted by A's to GM
# 2003 - Michael Lewis writes Moneyball
# 2003-present - Probably 20+ teams now have a statistical consultant on staff
http://www.sju.edu/~sforman/research...-21/node2.html