What ideas did Earnshaw Cook present in Percentage Baseball?

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Green retro manual baseball scoreboard beyond an empty, neatly mowed baseball field with brown infield dirt and striped grass outfield. — Sabermetrics A scoreboard provides some – but not necessarily the most useful – data on player and team performances in baseball.

In his 1964 book Percentage Baseball, Earnshaw Cook applied statistical analysis to the game, challenging traditional baseball strategies. While the book was not widely embraced by the baseball establishment at the time, it reached a broader audience through a profile in Sports Illustrated.1

A key contribution of Cook’s work was highlighting the importance of on-base percentage—a metric measuring how frequently a batter safely reaches base—which influenced future managers like Davey Johnson. Cook’s analytical approach helped lay the groundwork for what would eventually become sabermetrics, the empirical analysis of baseball statistics.1