A Bayesian Variable Selection Approach to Major League Baseball Hitting Metrics

Details A Bayesian Variable Selection Approach to Major League Baseball Hitting Metrics A Bayesian Variable Selection Approach to Major League Baseball Hitting Metrics

2009-11-23

arxiv.org/abs/0911.4503v1

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Scientific paper

Numerous statistics have been proposed for the measure of offensive ability in major league baseball. While some of these measures may offer moderate predictive power in certain situations, it is unclear which simple offensive metrics are the most reliable or consistent. We address this issue with a Bayesian hierarchical model for variable selection to capture which offensive metrics are most predictive within players across time. Our sophisticated methodology allows for full estimation of the posterior distributions for our parameters and automatically adjusts for multiple testing, providing a distinct advantage over alternative approaches. We implement our model on a set of 50 different offensive metrics and discuss our results in the context of comparison to other variable selection techniques. We find that 33/50 metrics demonstrate signal. However, these metrics are highly correlated with one another and related to traditional notions of performance (e.g., plate discipline, power, and ability to make contact).

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