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Old 03-29-2013, 10:36 PM
Location: Albuquerque, NM
13,293 posts, read 12,818,899 times
Reputation: 6637


Why Replacement Level? | FanGraphs Baseball

Why not just measure everyone against league average, and use WAA instead of WAR?

If the baseline is set to average, then the results of the metric will actually favor inferior talents whose lack of skills convince their manager to keep them chained to the bench in lieu of better players who actually take the field on a semi-regular basis. The 25th guy on the roster will end the season with a WAA very close to zero, but the guy who is good enough to start ahead of him but not quite produce at a league average rate will end up with a negative WAA, as he accumulated enough plate appearances to drive his value down.

Last year, Zack Cozart posted a .298 wOBA over 600 plate appearances, which translated into a -8.1 wRAA. Meanwhile, Tigers utility infielder Danny Worth posted a .275 wOBA in 90 plate appearances, so his wRAA was only -2.9.
A below average player still has value. Therefore, a the baseline against we measure a player needs to be below average.
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