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|Similarity Scores Glossary|
Similarity Scores -
Similarity scores were introduced by Bill James in his book The
Politics of Glory (pp. 86-106). To compare one player to another,
start with 1000 points and then subtract points based on the
statistical differences of each player. Note that a player must have 100 innings pitched or
250 at bats before being considered and to be truly accurate you need
to look at whole careers.
To this there is a positional adjustment. Each position has a value, and you subtract the difference between the two players position.
If they throw with a different hand and are starters subtract 10, relievers 25. For relievers you half the winning percentage penalty and the winning percentage penalty can up to 1.5 times the wins and losses penalty. Relievers are defined as more relief appearances than starts and less than 4.00 innings per appearance.
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