Tuesday, June 16, 2020
Park Impact, 2 of N: Strikeouts
Continuing our look after wOBA, we turn our attention to how the park impacts strikeouts.
The more red, the more the park adds strikeouts. The more blue, the fewer the strikeouts. Coors and Kauffman are the two parks that both keep strikeouts low. As it turns out, along with Chase, they are also the two parks that are at the highest elevation. By and large, fewer strikeouts means a batter's park and more strikeouts means a pitcher's park. And these results are somewhat in-line with that, though there are a few exceptions like Busch being a pitcher's park AND decreases strikeouts.
That last column is the standard deviation of the park impact numbers for strikeouts. We would have expected one SD to be 0.007. Instead, the average of these SD is 0.008. There's really no reason outside of Random Variation to see the bouncing up and down. If it went up and stayed up for a park, we can attribute it to some change in the background that helps (or hurts) the batter's eye. By and large, we don't see that.
Globe Life Park looks like a candidate that it could have happened. From 2001-2008, it helped the batter slightly, by reducing strikeouts by 0.005 per PA. From 2009-2014, it helped more, by reducing strikeouts by 0.011. Then from 2015-2019, it helped the batter tremendously by dropping strikeouts by 0.020 per PA. That said, one SD is 0.009, showing that it's not that alarming, but if someone knows the changes at Globe Life Park, then we might learn something.
(Click to embiggen.)
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