
Originally Posted by
TheIlladelph16
So my question is on the term "peripherals" when discussing the sustainability of certain stats. I actually have two questions related to this:
1. What constitutes a "peripheral"? (I believe stats like GB%, LD%, etc. are considered this)
Exactly.
Things like FIP, etc are not peripherals, but their 'exaggerated' statistics qualify instead.
2. How do you determine, when looking at the peripherals of a pitcher for example, what is sustainable in his stats and what is not?
Every stat has a different time frame before it starts to sustain.
For example, if you are a pitcher, your K/BB and K/9 and BB/9 all start to sustain around 30-50 innings. So basically, at this point this season, most of pitchers K and BB rates (as well hitters) are getting close to what they should be all season long, barring a major change from the hitter. This is also the same for kids in the minors (at least hitters). Your plate discipline can sustain rather quickly.
Things like GB rate, FB rate etc start to sustain close to 50 innings as well, but they are usually really good once you reach 100 innings (as a pitcher).
And then things like your LOB%, babip and things like that start to sustain much later, like 300ish innings.
but you can usually predict a pitchers babip within reason once their GB rate etc starts to sustain.
Everything has a sustainability level where they begin to become consistent, but they are all different.
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