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Defensive Metrics Newsbeat

Friday, September 21, 2018

Simon - Why Does Bryce Harper Have -25 Defensive Runs Saved?

Sounded some warnings about Bryce Harper’s defense in April. Here’s a revisit as the season nears an end. He’s at -25 Defensive Runs Saved, among the worst totals in MLB this season.


Jordan @metsfansince02
Do you think a move to first base next season is possible? I heard he was taking a lot of grounders there this year.

Mark Simon @MarkASimonSays
I think the money is in the outfield. The move to 1B comes later.

Bote Man the walk-off king Posted: September 21, 2018 at 08:05 AM | 11 comment(s)
  Beats: bryce harper, defensive metrics, nationals

Monday, August 13, 2018

Fangraphs: Jackie Bradley, Jr. and the Error Rule

To summarize:

1. The MLB rules state that the part of the error rule about ordinary effort is an objective standard.

2. The part of the error rule that says it’s all dependent on the judgment of the official scorer establishes a subjective standard.

3. Statcast is more 1. than 2.

IMO the standard of “ordinary effort” applies to any part of the fielding process, not the sum total. If a fielder gets an extraordinary jump, runs with extraordinary speed on an unusually efficient route, and then botches the catch, it doesn’t matter that ordinary effort wouldn’t have put him in position to make the catch. A fielder in position to make the catch will, in ordinary effort, make the catch. Failing to catch it, after getting into position, is an error. Failing to get into position to make the catch - through ordinary effort - is not an error.


Friday, July 06, 2018

Jeff Passan on Twitter: “1) I totally buy the idea that players can bring significant value via defense. 2) I have not seen every Cubs game this year, so maybe I’m missing something. 3) I stand by my years-old contention that publicly available defen

When you find a metric which surprises you, it’s best to dig into the data a little before you say something silly. Anway, and I know this is an outlier, the entire ?thread? is worth reading.

 

Jim Furtado Posted: July 06, 2018 at 04:45 PM | 48 comment(s)
  Beats: defensive metrics

Friday, April 06, 2018

Fangraphs: 2018 UZR and UZR Update!

The methodology has changed a little that allows UZR to account for some of the noise associated with imperfect data. The net result of this change is that extreme UZR’s, which were likely caused by, to some extent at least, noise in the data, rather than extreme performance, will be slightly ‘dampened.’ We think that these new values, while very close to the old ones in most cases, more accurately reflect the actual performance of the players in question.

I’ve always had a problem with trusting defensive metrics. The nature of the beast demands some level of uncertainty, and changing valuations — sometimes dramatically — does nothing to make me trust them more. The ‘dampening’ is particularly notable to players who have been hugely valuable based on these defensive metrics: Andrelton Simmons, Jason Heyward, Kevin Kiermaier, and several others. Adjust your Internet arguments accordingly.

Los Angeles El Hombre of Anaheim Posted: April 06, 2018 at 04:14 PM | 15 comment(s)
  Beats: defensive metrics, fangraphs

 

 

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