Calculating EAV | On Base Plus Slugging EAV | Cross Era Evaluations | Sabermetrics

[Photos left to right : Roger Connor, Babe Ruth, Ted Williams, and Hank Aaron]

How To Determine Era Adjusted Value.

Basically, Era Adjusted Value [called EAV in an abbreviated form] is a relative baseball batting statistic currently in development.

Simply, you first determine a ball players's on base percentage, his slugging percentage, and the combination of the previous two equations through addition called On Base Plus Slugging. Then you calculate the league's on base percentage, slugging average, and ops. Then divide the the player's stat into the league stat [with the ob%, slg%, and ops]. Finally, you leaf through a book or surf the internet, or get a fancy computer program to determine the player's home ballpark value, and finally divide the already relative value by the ballpark factor. In order to display longivity, players must have at least 5,000+ plate appearances to qualify for this stat.

example : Dick Allen

381 OB% + 534 SLG%= .915 OPS

The league average during his career was 356 OB% + 346 SLG%=.702

An above average EAV is over 100.000, while below average is .999 and below. These numbers represent the percentage above or below the league average.