wRC and wRAA

by
December 12, 2008

Tonight we’ve completed the phasing out of Runs Created (RC) and Runs Created per 27 Outs (RC/27). In their place you will find two run stats based off wOBA, which is a sounder metric than the previously used Runs Created.

Big thanks to Tangotiger for both creating the stats and walking me through how to calculate them correctly!

wRC – This is total runs created based of wOBA. It is calculated as (((wOBA – lgwOBA) / wOBAScale) + (lgR/PA)) * PA

wRAA – This is the number of runs above average based off wOBA. It is calculated as (wOBA – lgwOBA) / wOBAScale * PA

wOBAScale is typically around 1.15, but changes slightly from year to year depending on the weights used in wOBA.

Also, the previously named BRAA has been renamed to RE24 to clarify that it is based off the 24 base/out states.

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David Appelman is the creator of FanGraphs.

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Rahul
16 years ago

This is great, thanks. Can we expect something similar for pitchers using FIP? A Pitching Runs type of thing based on league Replacement/Average FIP?

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