**https://en.wikipedia.org/wiki/Wins_Above_Replacement#Analysis**

*... for a player is claimed to be the number of additional wins his team has achieved above the number of expected team wins if that player was substituted by a replacement level player: a player that may be added to the team for minimal cost and effort...*

*A high WAR value built up by a player reflects successful performance, a large quantity of playing time, or both combined...*

*There is no clearly established formula for WAR. Sources that provide the statistic calculate it differently. These include Baseball Prospectus, Baseball Reference, and Fangraphs. All of these sources publish the method they use ...*

*Baseball Prospectus is named WARP ...*

*Baseball Reference is named rWAR ...*

*Fangraphs is named fWAR... Compared to rWAR, the calculation of fWAR places greater emphasis on peripheral statistics...*

*... scaled equally for pitchers and batters ...*

*Because the independent WAR frameworks are calculated differently, they do not have the same scale*

^{[11]}and cannot be used interchangeably in an analytical context...

**Position players**

__Baseball Reference__

*Baseball Reference uses six components to calculate WAR for position players: ...*

*(1) batting runs,*

*(2) baserunning runs,*

*(3) runs added or lost due to grounding into double plays in double play situations,*

*(4) fielding runs,*

*(5) positional adjustment runs,*

*(6) replacement level runs (based on playing time)...*

*The first five factors are compared to league average ...*

*The positional adjustment is a value dependent on the players position:*

*+10.0 for a catcher*(12.5 in Fangraphs)

*−10 for a first baseman*(12.5 in Fangraphs)

*+3.0 for a second baseman*(2.5 in Fangraphs)

*+7.5 for a shortstop*

*−7.5 for a left fielder*

*−7.5 for a right fielder*

__Fangraphs__

The Fangraphs formula for position players involves offense, defense, and base running ... using

weighted Runs Above Average,

Ultimate zone rating (UZR),

Ultimate base running (UBR), respectively.

These values are adjusted using park factors, and a positional adjustment is applied ...

The positional adjustment is a value dependent on the players position:

*+12.5 for a catcher*(10 in Baseball Reference)

−12.5 for a first baseman (10 in Baseball Reference)

*+2.5 for a second*(3 in Baseball Reference)

+2.5 third baseman

*(2 in Baseball Reference)*
+7.5 for a shortstop

−7.5 for a left fielder

+2.5 for a center fielder (2.5 in Baseball Reference)

−7.5 for a right fielder

−17.5 for a designated hitter (15 in Baseball Reference) ...

*Pitchers*

__Baseball Reference__*Baseball Reference ...*

*Runs Allowed (both earned and unearned)*

*Innings Pitched*

__Fangraphs__*Fangraphs uses FIP (Fielding Independent Pitching)*

**WAR may be even more confusing than you think.**Sunday, August 16, 2015

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