In Search of the Veteran Benefit of the Doubt, Part Two
A little earlier, I played around with some strike-zone data. There’s a theory out there that umpires are more willing to give veteran pitchers the benefit of the doubt when it comes to called strikes. I wanted to investigate that, and sure enough, I was able to turn up a modest effect related to age and experience. However, my suspicion is that this has less to do with doubt benefits, and more to do with pitcher command. It makes sense that more experienced pitchers would be better command pitchers, and it makes sense that better command pitchers would end up with a little called-strike benefit given what we understand about good and bad pitch-framing, and so on. It’s something that could be investigated further, and I’ll think of what I did as a simple starting point.
Now, if we’re going to look at pitchers, we should also look at hitters. Just as there’s a theory that veteran pitchers get the benefit of the doubt, there’s also a theory that veteran hitters get the benefit of the doubt, in the opposite direction. In short, a lot of people believe that umpires are biased in favor of age and experience. I don’t know where this comes from, but enough people have repeated it that it’s worth a quick look with the numbers we have available. Once again, what follows isn’t exhaustive, but once again, it should get us started. If there’s any kind of major effect, this study should be able to find it.