Challenging Nostalgia and Performance Metrics in Baseball

@article{Eck2018ChallengingNA,
  title={Challenging Nostalgia and Performance Metrics in Baseball},
  author={Daniel J. Eck},
  journal={CHANCE},
  year={2018},
  volume={33},
  pages={16 - 25}
}
We show that the great baseball players that started their careers before 1950 are overrepresented among rankings of baseball's all time greatest players. The year 1950 coincides with the decennial US Census that is closest to when Major League Baseball (MLB) was integrated in 1947. We also show that performance metrics used to compare players have substantial era biases that favor players who started their careers before 1950. In showing that the these players are overrepresented, no… 
SEAM methodology for context-rich player matchup evaluations
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The SEAM (synthetic estimated average matchup) method for describing batter versus pitcher matchups in baseball is developed, both numerically and visually, and novel performance metrics that are calculated as expectations taken with respect to the spray chart distribution are provided.

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