Saturday, November 15, 2008

Plate discipline - part 2

Last week, I presented a new statistic which I call Plate Discipline Ratio(PDR) and applied it to the 2008 Tigers. Now, I'll apply the statistic to all of Major League baseball. Remember that Plate Discipline Ratio is derived from two statistics provided by Fangraphs.com: ZSWING and OSWING. ZSWING is the percentage of pitches in the strike zone at which a batter swung and OSWING is the percentage of pitches outside of the strike zone at which a batter swung. PDR = ZSWING/OSWING.

For example, Todd Helton had a ZSWING=66.5% and an OSWING=16.5%. His PDR=66.5/16.5=4.02. Thus, he was about 4 times as likely to swing at a pitch in the strike zone as he was to swing at one outside the strike zone. That is a very good ratio. Juan Pierre on the other hand, had a PDR of 1.75 meaning that he was less than twice as likely to swing at a pitch in the strike zone as he was to swing at one outside the strike zone.

There were no Tigers among the leaders and trailers. To see where the Tigers rank, see the first link above for the previous article. Tables 1 and 2 below contain the leaders and trailers for Major League Baseball in 2008.


Table 1: MLB Plate Discipline Leaders in 2008

MLB Rank

NAME

TEAM

ZSWING

OSWING

plate discipline ratio

1

Chris Iannetta

Rockies

72.3%

16.2%

4.47

2

Chipper Jones

Braves

67.2%

15.2%

4.42

3

B.J. Upton

Rays

64.8%

15.0%

4.33

4

Troy Glaus

Cardinals

63.3%

15.0%

4.21

5

Marco Scutaro

Blue Jays

63.4%

15.4%

4.13

6

Jack Cust

Athletics

62.8%

15.3%

4.11

7

Todd Helton

Rockies

66.5%

16.5%

4.02

8

Austin Kearns

Nationals

61.7%

15.6%

3.95

9

Daric Barton

Athletics

63.6%

16.4%

3.88

10

Carlos Ruiz

Phillies

57.1%

14.8%

3.85

11

Adam Dunn

Reds/DBacks

65.0%

17.2%

3.78

12

Brian Giles

Padres

65.1%

17.4%

3.74

13

Luis Castillo

Mets

46.8%

12.6%

3.70

14

Doug Mientkiewicz

Pirates

63.2%

17.1%

3.69

15

Denard Span

Twins

60.9%

16.7%

3.65



Table 2: MLB Plate Discipline Trailers in 2008

MLB Rank

NAME

TEAM

ZSWING

OSWING

plate discipline ratio

273

Darin Erstad

Astros

59.7%

35.8%

1.67

272

Juan Pierre

Dodgers

55.7%

31.8%

1.75

271

Alexei Ramirez

White Sox

76.2%

42.7%

1.78

270

Vladimir Guerrero

Angels

81.7%

45.5%

1.80

269

Clint Barmes

Rockies

65.0%

35.7%

1.82

268

Bengie Molina

Giants

74.7%

40.8%

1.83

267

A.J. Pierzynski

White Sox

74.4%

40.6%

1.83

266

Carlos Gomez

Twins

67.5%

36.8%

1.83

265

Alfonso Soriano

Cubs

71.6%

38.7%

1.85

264

Erick Aybar

Angels

64.6%

34.6%

1.87

263

Miguel Olivo

Royals

81.2%

43.2%

1.88

262

Jesus Flores

Nationals

69.4%

36.9%

1.88

261

Howie Kendrick

Angels

69.1%

36.6%

1.89

260

Mike Aviles

Royals

67.0%

35.5%

1.89

259

Adam Lind

Blue Jays

64.3%

34.0%

1.89

2 comments:

  1. Nice stat. I'd assume the ratio of in zone and out of zone pitches vary among hitters. For example, someone like Polanco is going to receive more in zone pitches than Guerrero. Is there a way to factor that ratio into the equation, or at least present the percentage of in zone pitches each batter receives? Doing so would give some context to the ratio.

    ReplyDelete
  2. crunruh, I thought about adding the ZONE statistic (% of pitches thrown in zone) to the equation but I'm not sure it's needed. Looking at the correlation, there seems to be no relationship between PDR and ZONE. It's probably a good idea to add it to the table though just to make it complete.

    ReplyDelete

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