Thursday, April 25, 2013
Is Quality Starts a useful metric?
(I will warn you that this post will not have an answer, but it will frame the question.)
This fellow googled it, and had a conflicting result. In order to determine its usefulness, you have to know what other metrics you have on hand. RBIs for example ARE useful, if you don't have SLG or OPS or wOBA.
The question therefore is better asked: "is this metric value-added?" Asked that way, ?it makes it clear that the answer is conditional on what else you have available.
Let's go back to Quality Starts. If you have quality starts, it's clear that you will also have available ERA by definition. If we convert QS into a percentage (QS per GS), the question is now: "Does the rate of starts that are QS provide any value-added to ERA, in establishing the effectiveness of the pitcher's performance?"
In short, if you have two pitchers, each with a 3.50 ERA, each with 4.0 run support per game, is that guy with more QS per start going to have his team win more (or less or the same) than the other guy?
So, that's my challenge for the apsiring saberists out there.
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