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Thursday, July 17, 2014

WaPo: Research supports the notion of the ‘hot hand’

Green and Zwiebel studied two million MLB at-bats from 2000 to 2011. They neutralized for the abilities of the hitter and pitchers — such as lefty-on-lefty matchups and stadium sizes — and focused on 10 major statistical categories, such as batting averages, home run percentages and strikeout rates.

They found that a hitter’s past 25 at-bats were a significant predictor of his next at-bat. When a player is hot, they found his expected on-base percentage to be 25 to 30 points higher than it would if he were cold. Home run rates jumped 30 percent and strikeout rates dropped. For pitchers in hot streaks, future performance was improved, too.

“The effect is fairly large,” Zwiebel said. “It’s highly significant not just in the statistical sense but the strategic sense. The effect is large enough where it makes sense for managers to sit a cold hitter or play a hot hitter, or perhaps the strategical adjustments for a pitcher to pitch around a hot hitter.”

Chris Needham Posted: July 17, 2014 at 11:28 AM | 80 comment(s)
  Beats: sabermetrics, statistics, stats

Tuesday, March 25, 2014

True Blue LA: Stop stat abuse

As much as people try to tell you otherwise, stats don’t lie. “Jack Morris would have one of the highest ERAs in the Hall of Fame” is not something up for debate as much as some would like to think otherwise. However, translating those numbers into something that predicts human behavior is damn near impossible. ESPN’s 2014 MLB preview brings us their new chemistry score. Through some simple inputs ESPN’s crack team is able to determine how much people like each other4. Not only that they’ve managed to turn compatibility into wins.

Unfortunately, part of this algorithm actually involves grading a team on racial purity. This leads to someone saying the difference in the AL West could be that “Dominican reliever Fernando Abad is the only nonwhite pitcher on the [Athletics] projected roster”, and the Dodgers will suffer because Hyun-jin Ryu and Kenley Jansen are the only people from their respective countries on the roster. Suggesting that the Dodgers would be better off if they managed to trade Ryu and Jansen for their white guy equivalents would look horribly racist 25 years ago, let alone today. However, because “it’s based on real math” there will be some people out there that take this seriously and argue the Dodgers should deal Ryu for Mike Minor.

This isn’t the last we’re going to see of this either. Baseball Prospectus suggests that we have the potential to use the new field f/x data to look into a players mental state and see if he’s depressed. This is incredibly dangerous. Being able to measure every single thing a player does means you can certainly find a smoking gun somewhere to prove whatever it is you want to, and making a leap from “this guys first step is slower” to “he’s suffering from mental illness” is hugely irresponsible. Again because it’s backed up with “evidence” people are going to take opinions like that much more seriously.

Tripon Posted: March 25, 2014 at 12:21 AM | 19 comment(s)
  Beats: abe attell, abominations, about damned time, absurd, sabrmetrics, statistics, wtf

 

 

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