Monday, December 02, 2013
WAR versus OPS+ and PA
In order to get WAR from OPS+ and PA, you do the following:
PA/10 * (OPS+/100 x .12 - .09)
The "10" converts runs to wins. The .12 is runs per PA. The ".09" is the baseline comparison level. You should change that ".09" for a player's position, along a scale like this:
- .07 C
- .08 SS
- .085 2B/3B/CF
- .10 LF/RF
- .11 1B
- .12 DH?
And then add in number of wins above (or below) average fielding-wise, relative to position.
If you don't like any of this, feel free to create your own. Just tweak it as desired.
As an illustration: Bobby Grich has 8200 PA, 125 OPS+, and spent virtually all his time at 2B. His WAR would come in as:
8200/10 * (125/100 x .12 - .085)
= 53 wins
Add in his fielding, which might be 5 to 10 wins, and you get a WAR of 60.
***
For you Fangraphs lovers, use wRC+ instead of OPS+. Grich is 129, which the above becomes a WAR of 57 + fielding, for a total of 65.
***
OPS+ is biased against high-walk, low-power guys, so, that's why there's the gap you see. But as long as we are subjected to the substandard calculation of OPS+, we deal with it.
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