Chapter 12: Researching Alternative Pitching Metrics
Our business users and most baseball analysts agree that quantifying the performance of pitchers is much harder than for batters, and our users want to investigate a number of alternatives.
Earned Run Average (ERA) has long been a default metric to evaluate pitchers despite its limitations. For starting pitchers, if they are replaced and the relief pitcher gives up a hit that scores any of the runners who are already on base, the starting pitcher is charged for those runs.
Likewise, if a relief pitcher allows “inherited runners” (i.e., those runners ...