Baseball is filled with statistics, rules, and archaic terms that can often form what sounds like a foreign language. Sons of Sam Horn’s glossary provides a better understanding of these terms through straightforward definitions, clear explanations, and examples pulled straight from the baseball world. If there is anything you would like us to add to our glossary, please contact us.
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?
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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