THE BOOK--Playing The Percentages In Baseball

Monday, February 01, 2010

Another example of the bias in OPS

By Tangotiger, 02:18 PM

This time from PAAPFLY.com:

Continuing my bashing of Bengie Molina, allow me to show you how his terrible OBP can be quite detrimental. Bengie Molina posted a .727 OPS in 2009, which isn’t very good. Ryan Theriot managed to post an even lower OPS of .712 in 2009. He must be the inferior offensive player. Wrong. Molina’s wOBA is actually .308 to Theriot’s .318. Though Theriot slugged 73 points less than Molina, his OBP was 58 points higher, and, wOBA shows us that his 58 OBP points to Molina’s 73 slugging points were actually worth an additional10 points in wOBA. This is just a quick example and a good way to illustrate just how much Molina’s extraordinary out making skills truly do hurt his team, offensively of course.

• Sabermetrics • Linear_Weights

#1 Ken (see all posts) 2010/02/01 (Mon) @ 16:05

Minor criticism - there is no bias in OPS, it just isn’t the perfect all-round measure of offense. By your definition, OBP, or SLG, or just about any other measure, is biased.

#2 Tangotiger (see all posts) 2010/02/01 (Mon) @ 16:36

OBP is not biased because it doesn’t purport to try to do anything other than measure what it does. SLG as well.

OPS, as used by people, IS biased, because people ARE using it a way to combine H, HR, BB in a balanced form. Because they do that, it exposes the bias in OPS.

wOBA has no such bias, since, like OBP and SLG, it was constructed exactly as it’s supposed to be used.

RC, VORP, EqA, etc DO have biases as well.

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THE BOOK--Playing The Percentages In Baseball

Monday, February 01, 2010

Another example of the bias in OPS

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