The Houston Astros sign-stealing scandal ignited widespread controversy, but a persistent question has remained: did the illicit scheme actually help the team win? While the ethical breaches were clear, the tangible impact on player performance and game outcomes has been a subject of debate, with various studies reaching conflicting conclusions. This discussion delves into the analytical efforts to quantify the efficacy of the Astros' sign-stealing operations,
revealing a complex picture where statistical analysis offers differing perspectives on the true advantage gained.
Studies Suggesting Minimal or No Benefit
Several analyses have concluded that the Astros' sign-stealing scheme provided little to no statistical benefit to their hitters. One prominent study, presented in a detailed article in The Ringer, found no evidence that knowing the nature of a pitch just before it was thrown actually helped the batter. This article, while addressing historical instances of illegal sign stealing, focused its deepest dive on the 2017 and 2018 Houston Astros. It specifically noted that Carlos Beltrán, often cited as a ringleader of the scheme, did not appear to benefit at all from the information. While one teammate, Marwin Gonzalez, might have seen some improvement, the overall statistics for the team's hitters did not show a clear advantage attributable to the scheme.Similarly, a study published in Baseball Prospectus reached a nearly identical conclusion. This analysis indicated that the Astros gained "no runs at all" from their sign-stealing efforts. Further supporting this perspective, a less comprehensive study conducted by two researchers at Duke University also concluded that the Astros did not benefit from the scheme. The Duke study specifically focused on comparing the team's performance in home games, where the scheme was primarily implemented, versus their performance in road games, where it was less prevalent or absent. These studies collectively suggest that despite the ethical violations, the practical on-field advantage might have been negligible.
Studies Indicating a Clear Advantage
Conversely, other detailed statistical analyses have concluded that the sign-stealing scheme did indeed aid Astros hitters. A study conducted by Ryan Elmore and Gregory J. Matthews, professors of statistics at the University of Denver and Loyola University Chicago, respectively, specifically analyzed the use of bangs to communicate stolen signs. Their findings pointed to three distinct ways in which the sign stealing clearly benefited hitters.First, their research indicated that the odds of a batter swinging at a pitch were approximately 27.5% lower when a bang was present prior to the pitch. This suggests that batters were more selective, potentially waiting for pitches they could hit more effectively. Second, if a batter did swing, the odds of making contact with a breaking ball were about 80% higher when a bang was present before the pitch. This implies that knowing a breaking ball was coming significantly improved a hitter's ability to connect with it. Third, when a swing and contact were made, the exit velocity of the ball increased by an average of 2.386 miles per hour when a bang was present. Increased exit velocity is directly correlated with better offensive outcomes, such as more hits and extra-base hits. These findings present a strong counter-argument to the studies that found no benefit, suggesting that the illicit information did translate into measurable improvements in hitting performance.
