Judge: Statcast launch angle: a statistical accuracy assessment

From SABR member Jonathan Judge at Baseball Prospectus on August 2, 2019:

Several weeks ago, we looked at the accuracy of Statcast launch speed (a/k/a “exit velocity”) measurements, and some of the stadium effects that might be confounding those measurements. Today we’ll move on to launch angle.


The modeling approach for launch angle is substantially the same as for launch speed. The general details, including the removal of probably-imputed values, are described in the previous article.

For launch angle, a hierarchical model was fit with varying coefficients assigned to the groups of batters, pitchers, and stadiums who all had at least one batted ball in play. We placed a unit exponential prior on the precisions of these effects.

Read the full article here: https://www.baseballprospectus.com/news/article/52079/statcast-launch-angle-a-statistical-accuracy-assessment/

Originally published: August 2, 2019. Last Updated: August 2, 2019.