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Thursday, September 24, 2009
Slugging on Balls In Play
Matt presents SLG on balls in play (excludes HR).
Some of you may remember when Dan Fox released his BIP spray chart app, and I suggested adding “wOBA on contacted plays”. What Matt is doing here is similar in spirit, in that you want to count the doubles and triples differently from the single.
You simply could do a wOBA and exclude BB, HB, K, HR. That means setting the single and reaching on error to around .9 and a double or triple to 1.3 (or use the .90, .92, 1.24, 1.56 numbers from The Book). If that is too much, you can try to combine baBIP and slgBIP ala OPS.
Since we know from wOBA what the target coefficients need to be, then a weighting of .55 for baBIP and .35 for slgBIP does the trick in terms of aligning it to wOBA. That gives you the proper balance, and sets it on the baBIP scale (average of roughly = .300).
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