Quote:
Originally Posted by ASURay
From my limited testing, using the formula:
MOV = -25.8575 + (.475018 * MOVraw) + (.943775 * GB%)
gets you very close to the displayed MOV rating.
|
To make this less of a statistical black box, the actual way it seems to be done is the following:
1) Divide the raw MOV rating by 2 and add 25.
This is because these raw ratings are out of 130, but the actual MOV scale seems to be from 25-90, so this projects 0-130 onto 25-90.
2) Adjust for GB% by adding (0.885*(GB%-55.8)).
The average "Neutral" GB% pitcher has a GB% of about 55% rather than 50%. We know this because the NEU GB% range extends from something like 50-60%, roughly. So, this GB% adjustment changes your final MOV by accounting for how far away you are from true neutral. I gathered about 10 data points or so to come up with the coefficients, but this should be pretty close; I checked like 10 randomly selected pitchers and the (rounded) values were exact.
This is nearly the same formula as what ASURay has, but I think it's instructive to see why the values are what they are.