We’ve made some slight changes to the way WAR is calculated. The changes will impact players at most, about 0.5 wins, but the vast majority of individual player WAR will remain pretty unchanged.
1. Position player WAR now includes ground into double play avoidance (or lack thereof) with the stat wGDP. This will impact the very best players about +/- 0.5 wins. All but a few will fall in the +/- 0.2 win range. wGDP is also available as a separate stat in both the leaderboards and the player pages.
2. UBR has been updated to include advances and outs on WP and PB, as well as a few minor changes. Big thanks to Mitchel Lichtman for this and the wGDP inclusion.
3. Pitcher WAR park factors have been changed to FIP specific park factors. You can see all the new park factors under FIP in the FanGraphs Guts! Section. FIP park factors in general are considerably more compressed than runs park factors, so pitchers in extreme parks will be less impacted. Thanks goes out to Noah Baron for the suggestion.
4. We’ve adjusted the pitcher WAR league baseline to better even out the leagues.
David Appelman is the creator of FanGraphs.