50/50 WAR for Pitchers Added to WAR Leaderboard

Yesterday, we rolled out a new WAR leaderboard here on FanGraphs, giving you the ability to see position players and pitchers in the same spot. Today, David Appelman has made this tool even better by allowing you to choose between three flavors of pitcher WAR, since not everyone agrees on how pitcher performance should be evaluated.

The default remains our WAR based on a pitcher’s FIP (and infield flies), but now you, can also choose to see the list with a pitcher’s WAR based on runs allowed (RA9) or a 50/50 blend of both. While giving a pitcher credit for half of the difference between his FIP-WAR and his RA9-WAR gets away from the “trying to measure exactly what happened” concept, it probably is a more accurate portrayal of a pitcher’s overall value than either FIP or RA9, which take the most extreme positions possible on the amount of credit or blame a pitcher should get for the results of balls in play.

Blending the two is a very crude and imperfect way to look at things, and also means that you get into double counting defensive performance at the team level — the value of hits being turned into outs is already being credited to position players — but on the individual player level, it probably is closer to the truth of the pitcher’s value in that season than either FIP or RA9.

Empirically, there’s not a lot of evidence that blending the FIP and RA9 evenly is correct, but if you’re just looking for a quick-and-dirty way to give the pitcher some credit/blame for his in-play results and sequencing, this likely gets you in the ballpark. None of the three versions of pitcher WAR are “correct” in every single situation, so we’re giving you the ability to pick your poison based on your own preferences. Enjoy!





Dave is the Managing Editor of FanGraphs.

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Mikemember
9 years ago

Very cool