The Quality of Cole Hamels’ Opposition
We’re used to making little adjustments all the time. Most commonly, it’s because of ballpark environment. A .350 wOBA in San Francisco is a hell of a lot more valuable than a .350 wOBA in Arizona. Sometimes you’ll also see adjustments for era, which is relevant now given increasing strikeouts and decreasing runs. There are raw stats, and there are adjusted stats, like, say, wRC+, but there’s one adjustment we seldom talk about even though it’s right there in front of our faces. What about the opposition a player actually faces?
It’s like strength-of-schedule, on the player level. No one debates the utility of strength-of-schedule measurements. Now, in baseball, what’s convenient is that the samples get pretty big so we can generally get away with assuming that things even out. Over broad windows, no one’s going to face exclusively awful opponents or awesome opponents. But in certain cases, it’s worth digging in when we have a suspicion. As such, I want to go into more detail on something I noted about Cole Hamels earlier.