SoSH Glossary: Weighted Runs Above Average

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Weighted Runs Above Average

Weighted runs above average, or wRAA, is an offensive statistic that measures how many runs a player contributes or costs his team compared to an average player. The stat is based on wOBA, but is expressed in runs rather than a ratio. A wRAA of zero is considered league average, while a positive wRAA is above average, and a negative wRAA is below average. Weighted runs above average is a counting statistic, so the more plate appearance a player has the higher his wRAA should be (assuming he is above average).

How Is It Calculated?

wraa

Why Is It Important?

wRAA is a crucial component in the calculation of FanGraphs’ Wins Above Replacement. wRAA is adjusted for home park and league, and then you have your offensive component. 10 runs of wRAA equals 1 win for purposes of WAR.

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