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Tuesday, September 07, 2010
Reader mail of the day: Understanding wOBA
Someone asked me how do I figure out the formula without reaching base on error. My answer below is why I love the logical underpinnings of wOBA:
You always start off at runs above out for each event that you have. And then, this is the important part, make sure that the weighted sum of your events equals the unweighted sum.
Suppose for example that all you have is BB+HR. You have 60 BB and 20 HR, or 80 times on base. You also know that a walk is +.6 runs above out, and a HR is +1.7 runs above out. That means 0.6*60 + 1.7*20 = 70.
In order to align the two, you multiply by 80/70.
If all you had was say doubles and HR, you do the same thing. So, when it comes to ROE, or not, you do the same thing.
Tom
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