Plate Discipline
Stat of the Week
by Peter Liubicich
Plate Discipline
This post was written by Peter Liubicich on November 5, 2012
Posted Under: Stat of the Week

Plate discipline is a statistic that helps us understand both the effectiveness of a pitcher and their ability to make hitter’s chase pitches out of the strike zone, and how disciplined a batter is at the plate and not swinging at pitches they have a low percentage chance of hitting.  According to FanGraphs there are nine different statistics that measure plate discipline:


This week we’ll look at swing percentage statistics for plate discipline.  These statistics are not complicated but a lot of information about how well a pitcher is throwing and fooling batters or how well a batter is picking up the ball out of a pitcher’s hand and identifying the pitch can be told from these statistics.  O-Swing% stands for the pitches swung at that are outside of the strike zone, Z-Swing% stands for the percentage of pitches a batter swings at inside the strike zone and Swing% represents the total number of pitches a batter  swings at when they’re at the plate.

FanGraphs receives its information on the swing habits of batters from Baseball Info Solutions, which you’ll remember, also conducts the research for fielding statistics such as Ultimate Zone Rating (UZR).  The league average for O-Swing%, Z-Swing% and Swing% are:

O-Swing% - 30%

Z-Swing% - 65%

Swing% - 46%

Thursday, we’ll look at the swinging habits of the players with the highest walk totals and highest strikeout totals through these plate discipline statistics, as well as look at the Swing% numbers of the pitchers with the highest strikeout numbers and highest walk numbers.

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