Equivalent Average

Equivalent Average (EqA) is an offensive rate statistic developed by Clay Davenport and often appears in the work of Baseball Prospectus. It is based on Equivalent Runs (EqR), and in its full form is adjusted for park and league environment. The scale of EqA is intended to mimic that of Batting Average, with .260 representing average, .300 a good performance, and .400 an extraordinary performance.

EqA Formula

EqA is based on EqR per out. The transformation to the Batting Average-like scale is achieved by dividing EqR per out by 5 and raising to the .4 power:

EqA = (EqR/Out/5) ^ (.4)