Bryan Crosnick calculated the exact way in which we'd put each version of WAR (fWAR, rWAR and WARP) on the same scale. These all use different replacement levels so thanks to his work we can now compare these players using the same replacement level.
2012 fWAR to rWAR Conversion: -0.00094 fWAR/PA
2012 WARP to rWAR Conversion: 0.00046 WARP/PA
Comments
So add 0.47 to fWAR over 500 PA. (Or 0.5 for ease)
And about half that to WARP.
Those #s I might remember. 0.00097 I won’t.
mobile SVBQuote Reply
I thought one of the key differences between them was how they calculated defensive metrics. Also is Fangraphs the only one that incorporates baserunning?
joshQuote Reply
@ josh:
Yeah, they use different defensive metrics, but they also use a different replacement level baseline. Replacement level is around a .300 winning percentage. In other words, if you filled your team with replacement level players you’d end up with a winning percentage of .300. Some systems use different baselines (they believe it’s lower or higher and have good reason to do so). It really doesn’t matter what baseline they use (they could use average if they wanted), but it’s nice to know how we’d convert them to the same scale.
mb21Quote Reply
josh wrote:
All 3 have a baserunning component, though b-ref only uses steals, caught stealing, passed balls, wild pitches, and defensive indifference. Baseball Prospectus uses BRR (base-running runs).
From the B-Pro Glossary:
Rizzo the RatQuote Reply