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Jim Furtado
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Monday, August 20, 2018

How are the Diamondbacks 200 runs better than the Phillies on defense? | The BIS Blog

I received a tweet recently that asked if I could demonstrate the difference between the team with the most Defensive Runs Saved (the Diamondbacks with 120) and the team with the fewest (the Phillies with -102).

It seemed a reasonable question to wonder – can the difference between the two be more than 200 runs? We wouldn’t question the best and worst teams being that far apart in terms of their offense or their pitching. But for defense, we don’t have as good a feel for the value of certain statistics.

It’s important to note that when we give a team’s DRS total, that represents the sum of their players’ DRS. It’s not a value solely assigned to the team, but rather the accumulation of many values.

With that in mind, let’s go through a few notable positions around the diamond.

Jim Furtado Posted: August 20, 2018 at 02:08 PM | 34 comment(s)
  Beats: diamondbacks, drs, fielding, phillies

Thursday, July 26, 2018

J.D. Martinez’s Defense? What The Numbers Really Say

The graphics are goofy; the videos are useful; the conversation is fantastic. A moderate-depth piece from Alex Speier on why some advanced defensive metrics aren’t advanced enough.

“Statcast data has changed the way that internally teams are doing defensive evaluations,” Stern told Martinez. “But to the best of my knowledge, I don’t think very much of that is public, so it hasn’t really changed any of the public-facing numbers that people have access to.”

Martinez had heard similar feedback last year after he was traded from the Tigers to the Diamondbacks. With Detroit, Martinez had graded as well below-average. After his trade, UZR and DRS offered favorable numbers for his work. Martinez recalled a conversation with Arizona head of analytics Mike Fitzgerald in which he discussed the disparity.

“My [UZR] has always been a negative in the outfield,” recounted Martinez. “Then I go to Arizona and my [UZR] is positive. I go, ‘What’s the difference?’ He said, ‘Now we’ve got you positioned right.’ ”


 

 

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