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Tuesday, February 03, 2009
A word on RBIs
I posted this on USSM, but I figure a few newcomers might want to have a quick reason to eschew RBIs:
You have to ask yourself what do RBIs represent. They are a combination of: a player’s hitting talent, the number of runners he has on base, and the timing to match these two.
wOBA, EqA, Linear Weights (LWTS), etc, all give you the player’s hitting talent. The number of runners a hitter sees on base has nothing at all to do with his talent level. So, you try to remove that aspect, and you get RE24 (which you can find at Fangraphs), which is Linear Weights by the 24 base/out states.
So, if you have RE24, then RBIs now become useless, as they contain no information at all, that you cannot find in RE24, insofar as the player’s hitting talent and his timing. RBIs are a subset of RE24.
The question then comes LWTS or RE24. You can make a case for either.
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