Value Approximation Method

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   6 for 290-339
   6 for 290-339
etc.
etc.
 +
 +
C) Add value for "net decisions" (2*Wins + 2*Saves - Losses)
 +
  0 for  0- 5
 +
  1 for  6-13
 +
  2 for 14-23
 +
  3 for 24-35
 +
  4 for 36-49
 +
  5 for 50-65
 +
  6 for 66-83
 +
  7 for 84 or more
 +
 +
D) Add 1 to VAM if he won 18 or more games
 +
 +
E) Add 1 to VAM if he led his league in ERA
 +
 +
F) Add 1 to VAM if he led his league in saves
 +
 +
G) Subtract rounded ERA adjustment from VAM but if this makes his VAM negative, his VAM is zero.
 +
 +
<math>ERA adjustment  = \frac{(Wins+Losses) \times (1+league ERA - his ERA)}{13}</math>
 +
 +
For non-pitchers:
 +
A) Each non-pitcher VAM is initially based on his season's games played:
 +
  0 for  0-  9 G
 +
  1 for  10- 49
 +
  2 for  50- 99
 +
  3 for 100-129
 +
  4 for 130 or more
 +
 +
B) Add value for [[Batting Average|Batting Average]]:
 +
  0 for .000-.249
 +
  1 for .250-.274
 +
  2 for .275-.299
 +
  3 for .300-.324
 +
  4 for .325-.349
 +
  5 for .350-.374
 +
  6 for .375-.399
 +
  7 for .400 or more
 +
 +
C) Add value for [[Slugging Percentage]]:
 +
  0 for .000-.299
 +
  1 for .300-.399
 +
  2 for .400-.499
 +
  3 for .500-.599
 +
  4 for .600-.699
 +
  5 for .700-.799
 +
  6 for .800 or more

Revision as of 02:50, 16 November 2009

Value Approximation Method (VAM) is a baseball statistic invented by Bill James to compare players' seasons. VAM rewards both quality and quantity. VAM emphasizes its imprecise nature in both its name and by being an integer. A poor player who hardly played would have a VAM of 0, 1, or 2 while a league MVP usually is a little below 20. VAM was privately published by James in 1980[1] and first publicly published in 1982 [2].

Method

For pitchers: A) Each pitcher VAM is initially based on his season's games pitched: 

 0 for less than 30 G 
 1 for 30-54
 2 for 55-79
 3 for 80 or more

B) Add value for Innings Pitched: 

 0 for less than 40 IP 
 1 for  40-89
 2 for  90-139
 3 for 140-189
 4 for 190-239
 5 for 240-289
 6 for 290-339

etc.

C) Add value for "net decisions" (2*Wins + 2*Saves - Losses) 

 0 for  0- 5 
 1 for  6-13
 2 for 14-23
 3 for 24-35
 4 for 36-49
 5 for 50-65
 6 for 66-83
 7 for 84 or more

D) Add 1 to VAM if he won 18 or more games

E) Add 1 to VAM if he led his league in ERA

F) Add 1 to VAM if he led his league in saves

G) Subtract rounded ERA adjustment from VAM but if this makes his VAM negative, his VAM is zero. 

ERA adjustment  = \frac{(Wins+Losses) \times (1+league ERA - his ERA)}{13}

For non-pitchers: A) Each non-pitcher VAM is initially based on his season's games played: 

 0 for   0-  9 G 
 1 for  10- 49
 2 for  50- 99
 3 for 100-129 
 4 for 130 or more

B) Add value for Batting Average: 

 0 for .000-.249 
 1 for .250-.274 
 2 for .275-.299 
 3 for .300-.324 
 4 for .325-.349
 5 for .350-.374 
 6 for .375-.399 
 7 for .400 or more

C) Add value for Slugging Percentage: 

 0 for .000-.299 
 1 for .300-.399 
 2 for .400-.499 
 3 for .500-.599 
 4 for .600-.699
 5 for .700-.799 
 6 for .800 or more
Retrieved from "http://encyclopedia.sabr.org/wiki/Value_Approximation_Method"
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