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WAR Comparison Chart

Comparison of Different WAR Systems

Main WAR page

WAR is really just an idea of how to value players. Once you have the idea in place, there are dozens of implementation details that have multiple reasonable approaches to take. We've summarized the major frameworks below for easy comparison.

FanGraphs also has an explanation of their WAR and our previous WAR framework. Baseball Prospectus has their framework, WARP. I'm happy to add more WAR frameworks like Baseball Gauge's WAR if folks want to help me fill in the details below.

Name Previous B-R WAR, 1.0 FanGraphs WAR Updated B-R WAR, 2.2 Prospectus PBP WARP Prospectus Historical WARP
Abbreviation rWAR (for Rally WAR, "RallyMonkey", Sean Smith created this version) fWAR rWAR, maybe bWAR? WARP WARP
Offensive Batting Metric Used BaseRuns based offensive measure, so sum of players batting runs equals team total. wRAA wRAA with additional tweaks Empirc LWTS, plus situational runs (DP, SH, SF) BaseRuns-derived LWTS
Fielding #'s Used Total Zone Ratings using PBP when possible. TZR pre-2002, Ultimate Zone Rating 2002 and after TZR pre-2003, Baseball Info Solutions Defensive Runs Saved with Batted Ball Timer 2003 and after FRAA FRAA (non pbp)
Starting Point for Pitching WAR Runs Allowed Fielding Independent Pitching Runs Allowed Runs Allowed
Batting Details
Adjusted for park Yes 5-year regressed park factors 3-year park factors Regressed component factors converted into run-based PFs (up to 5 years)
Park Factor Applied to Batter or League Average Batter Batter Batter League League
Computes Batting Lg Avgs using entire MLB or individual leagues Ind. Leagues All of MLB Ind. Leagues Ind. Leagues
Includes P's in Lg Avg No Yes No No
Includes ROE Yes No Yes Yes
Estimates CS for seasons it is unknown Yes No Yes --
Includes SB/CS in Batting or Baserunning In Baserunning In Batting In Baserunning In Baserunning
Includes Positional Adjustments Yes Yes Yes, across lgs always sum to 0 Yes
Varies Replacement Level by Lg's Quality of Competition Yes No Yes Yes
Caps total contribution by Replacement Level Runs to prevent overvaluing of leadoff hitters Yes No No No
Counts SO and non-SO outs separately Yes No Yes Yes
Directly uses the PythagenPat WL% estimator to compute Wins Above Avg No No Yes No
Runs to win calculation includes the league run environment Yes Yes, but not described for batters Yes Yes
Runs to wins calculation includes the runs the player adds or subtracts No No Yes No
Differentiates between infield and outfield singles from 2003 on. No No Yes All Seasons
Adjusts for ability to avoid double plays Yes No Yes Yes
Adjusts for Non-basestealing baserunning Yes Yes Yes
Available in a form with fielding metrics excluded Yes, oWAR is WAR with defensive runs assumed to be zero or average No Yes, oWAR for offensive WAR VORP
Fielding Details
Uses measures for player range Yes, TZR Yes, UZR or TZR Yes, DRS or TZR Yes, FRAA
Uses measures for OF arms and DP ability Yes Yes Yes Yes, BRR Against
Uses measures for catcher throwing Yes Yes, DRS Yes, DRS Not yet
Uses measures for good plays and misplays like relay throws or missing the cutoff man No No Yes, DRS No
Uses measures for catcher defense including blocking pitches and framing No Yes on blocking, but no on framing Yes, DRS No
Pitching Details
Years Available 1871-present 1974-present 1871-present 1950-Present
Uses Park Factors Yes, 3-year Yes, 5-year, regressed Yes, 3-year Regressed component factors converted to run-based PFs (up to 5 years)
Adjusts Park Factors to parks actually pitched in No No Yes Yes
Park Factor applied to pitcher or run support? Lg Avg Pitcher Pitcher Lg Avg Pitcher Run Support Run Support
Adjusts league average by teams pitched against Yes No Yes No
Adjusts league average for interleague play No No Yes Yes
Adjusts replacement level by quality of league Yes No Yes Yes
Recent replacement level .320 (52-110) .294 (48-114) (link) .294 (48-114)
Directly uses the PythagenPat WL% estimator to compute Wins Above Avg No No Yes No
Runs to win calculation includes the league run environment Yes Yes, but not described for batters Yes Yes
Runs to wins calculation includes the runs the player adds or subtracts No Yes Yes Yes
Adjusts runs to win calculation by length of pitcher's outings No Unclear, I believe no Yes Yes Yes
Adjusts runs above replacement level for when pitcher is starter or reliever Yes Yes, as part of replacement level calculation Yes, but it is applied to avg rather than replacement Yes Yes
Adjusts performance by team defense Yes Not applicable since FIP-based Yes Yes Yes
Adjusts Reliever WAR by Leverage Index Yes Yes, I believe it is applied to the WAR value Yes, Applied to WAA and then recentered to not affect league total WAA No No
Credits starting pitcher for effect on saving/taxing bullpen No No No Yes
Other Details
Converts WAR into FA Salary Values No Yes No No
Downloadable No Yes, annual and custom reports dowloadable to excel Yes, full historical csv updated daily and usable by anyone with citation and link Yes, via sortables No (but eventually yes)