“Don’t read into Spring Training stats” is a good surface level mantra to hold on to. The competition is uneven, the results don’t matter, and the players are all working on things in preparation for the regular season. To some extent, it’s like looking at September numbers on a non-contending team: those are very different from May numbers.
Even the benefits of a huge surge in results is only slightly predictive. There’s the study from John Dewan about a huge slugging percentage breakout in the spring, but recently work by Ben Lindbergh and Jon Shepherd poked some holes in the theory.
If you look at when stats stabilize, however, there are a few stats worth checking out. We know from Jeff Zimmerman that fastball velocity stabilizes very quickly, and so it’s worth reading his MASH articles to find the most recent gun readings on pitchers.
And we know that strikeouts stabilize quickly — 100 plate appearances for batters, 126 batters faced for pitchers. A spring is something like a half of a September, so it doesn’t get to those thresholds, but the evidence is there that strikeouts become meaningful quicker than most stats, and so therefore spring strikeouts may be worth keeping an eye on.
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