TSBG Versus High and Low Fastballs

As suggested by Rich in the previous post, here's a look at how Brett Gardner's done against fastballs that I'm categorizing as high, middle or low. Here's what I did to determine whether a fastball was high or low. Pitch FX defines the fields sz_top and sz_bot as the top and bottom of the strike zone for the specific batter. It's measured in feet, and for Gardner they were on average 3.19 and 1.4 respectively. So Gardner's strike zone is about 1.8 feet in Pitch FX. It also defines the fields px and pz as the location where the pitch crossed the front of the plate. I don't really care about px here (inside or outside), so I'm focusing on pz. Any pitch defined as a fastball that had a pz higher than 2.7 feet is considered high. Any pitch that came in between 2.7 and 1.8 feet is defined as a middle of the zone fastball, and anything that came in lower than 1.8 feet is considered low. And here's how it split out. Type # max min avg ball % ...