First-Pitch Strikes, Plate Discipline and Players Due to Bounce (or Fall) Back: Part 1
Back in September, Bill Petti at Beyond the Boxscore took a look at the year-to-year correlations of a set of hitting metrics. Some of the stats you’d expect had no year-to-year staying power (AVG, BABIP); some you would think are skill based turned out to vary greatly (Line Drive Rate); while some metrics proved to be remarkably consistent (Contact Rate, Swinging Strike Rate).
What jumped out to me was that First-Strike Rate had only a .56 year-to-year correlation for batters, while all of the stats I’d expect to directly impact First-Strike Rate (Swing Rate, Contact Rate, etc.) were quite consistent. First-pitch strikes make a huge difference in any at-bat, and the high year-to-year variation in this stat suggests that, over the course of a season, some hitters may have very good or very bad luck in this area. After looking at Petti’s analysis, I looked deeper into the phenomenon of F-Strike% and have three posts coming – starting with this one looking at my methodology and the basic information I found.