This is the program for the 2010 Joint Statistical Meetings in Vancouver, British Columbia.

Abstract Details

Activity Number: 325
Type: Invited
Date/Time: Tuesday, August 3, 2010 : 10:30 AM to 12:20 PM
Sponsor: Section on Statistics in Sports
Abstract - #306115
Title: Modeling the Impact of MLB Bullpen Use and Abuse
Author(s): James J. Cochran and Martin S. Levy*+
Companies: Louisiana Tech University and University of Cincinnati
Address: , Cincinnati, OH, 45202,
Keywords: baseball ; linear model ; relief pitching ; performance

Baseball players, managers and coaches, front office staff, announcers, writers, and fans almost unanimously agree that the quality of performance of an MLB relief pitcher declines as his usage in recent games increases. The logic of this adage is straightforward; an increase in usage results in an increase in fatigue/decrease in stamina, which ultimately has a deleterious effect on performance. While this seemingly reasonable adage has become part of accepted baseball wisdom as the role of relief pitching has evolved over the past several decades, it has not been subject to rigorous analytic scrutiny. We systematically consider the questions i) is this adage true? and ii) if this adage is true, what is the nature of the relationship between the quality of performance of an MLB relief pitcher and his usage in recent games?

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