QOP in the News

Home Run Surge

• Hoornstra, J.P.  Does a rise in home runs explain why pitchers throw fewer strikes in 2019?  The Orange County Register.  Aug 7, 2019.
• Hoornstra, J.P.  What’s in a pitch? A Biola statistician connects a change in the baseball to movement.  The Orange County Register.  Dec 5, 2018.
• Betua, Emma.  Pitch Physics May Reveal Explanation For MLB’s Mysterious Home Run Spike.  Inverse.  July 24, 2018.
• Butterworth, Trevor.  Why did home runs surge in baseball? Statistics provides twist on hot topic.  Phys.Org.  July 17, 2018.
• Wilson, Jason and Wayne Greiner.  Explaining the MLB 2017 Home Run Record with Quality of Pitch.  The Hardball Times.  May 8, 2018.
• Wilson, Jason, Jordan Wong, Jeremiah Chuang, and Wayne Greiner.  Explaining the MLB Home Run Record of 2017 with QOP.  Technical Report.  2018. Appendix A. Appendix B.

Other News

• “Wikipedia Article” → “Quality of Pitch.  Wikipedia.”
• Green, Austin.  Everything Eagles: Math professor, alumnus pitch in with Quality of Pitch metric.  Chimes.  Apr 1, 2019.
• Bullock, Laurie.  Pitching a New Statistic.  Biola Magazine.  Winter 2016.
• DiGiovanna, Mike.  Angels’ Joe Smith threw baseball’s best pitch — in 2010.  Los Angeles Times.  March 12, 2015.

Articles & Presentations

• The Home Run Spike of MLB 2019: Quality of Pitch is a Factor, Joint Statistics Meetings, 2019.
• The Home Run Spike of MLB 2017: Drop in Quality of Pitch (QOP) is a Missing Factor, Joint Statistics Meetings, 2018.
• Explaining the MLB 2017 Home Run Record with Quality of Pitch.  The Hardball Times.  May 8, 2018.
• Measuring the Quality of a Pitch.  The Hardball Times.  March 16, 2017.
• The Relationship Between QOP and Results, Joint Statistics Meetings, 2016.
• Pitch Quantification: Quality of Pitch and the Greiner Index.  SABR Conference, March 12, 2015.
• A Curveball Index: Quantification of Breaking Balls for Pitchers.  CHANCE.  27:3, 2014.

Technical Work

• Explaining the MLB Home Run Record of 2019 with QOP.  Technical Report.  2019. Appendix H.
• Explaining the MLB Home Run Record of 2017 with QOP.  Technical Report.  2018. Appendix A. Appendix B.
• Measuring the Quality of a Pitch.  Technical Report. 2017.
• The 2015 MLB Season in Review Using Pitch Quantification and the QOP Metric.  SABR 2016 Presentation Proposal.  2016.
• Pitch Quantification Part 1: Between Pitcher Comparisons of QOP with Conventional Statistics.  Technical Report.  2015.
• Cross-Validation Results.  Table.  2015.
• Margin of Error Guide for QOPAs.  Table.  2015.