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Quality of Pitch

Quality of Pitch

QOP Pitch Quantification

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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

  • Hoornstra, J.P. New Sign Stealing Report Corroborates Evidence Against Astros and Red Sox The Orange County Register.  Aug 19, 2020.
  • “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.

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