There are all kinds of ways to measure the effectiveness of a pitch. Pitch Values (pVals) or “Pitch Type Linear Weights” give us a sense of, from the glossary, “…the changes in average run expectancy from one count to another”.
while the changes in run expectancy between an 0-0 count and a 0-1 or 1-0 count are obviously very small, when added up over the course of the season, you can get an idea of which pitch a hitter was best against.
pVals are not predictive and they don’t explain the true talent or raw characteristics of an individual pitch the same way Stuff+ or other pitch models can, but it does tell us what actually happened. Now, imagine that! You can dig into the specifics of pVals on the glossary page but for now, let’s celebrate this season’s greatest pVals.
Part one will look at four-seam fastballs and cutters. Part two (coming soon) will focus on sinkers and splitters.
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