Tuesday, May 07, 2013
Reader Mail of the Day: Power metric
A reader sent me an email, asking about a power metric, and he touched upon the different ways to measure it, using traditional stats. Basically:
1. TB divided by H (or equally SLG/BA, since both use the same? denominator, you get the same result). In this case, we are simply looking at hits as the opportunity factor. If you have 200 TB in 100 H, it doesn't matter if you did that in 300 AB or 600 AB. The outs are irrelevant.
2. (TB-H)/AB, or ISO or SLG-BA. All are the same thing. In this case, our opportunity factor is at bats.
3. (TB-H)/(AB-SO). Similarly, it's trying to find the opportunity factor, and in this case, it's contacted plate appearances. And as #2, we remove the first base.
4. SLG/wOBA. This one is a bit more odd. I don't like this one, because it says that the more a hitter walks, the less power he has.
Anyway, I don't like these approaches, because it starts with the answer. There's no reason being given for what is intended to be measured. It instead asks: "what does it mean if I combine the metrics in these ways?". It's not the best way to create a metric.
So, forget all the numbers, and forget all the metrics, forget that SLG and ISO even exist, and simply ask the question as to what you need. THEN, we can figure out how to create an appropriate metric.
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