We care a great deal about outcome statistics like BB%, K%, wOBA, etc, but we also want to know some of the underlying factors at play. Plate discipline stats are very important for hitters and pitchers because they tell you about a hitter’s approach (or hitters’ approaches against a pitcher). Additionally, our BIS data updates nightly during the season, but on a delay, so recognize that the most recent games may not be include when using that particular set of stats.
You can also find plate discipline data on player pages and can use the “Averages” button to show the player’s numbers next to league average for that year. Here are the 2014 plate discipline leaderboards for hitters according to BIS data, and here are the same leaderboards according to PITCHf/x data. SwStr% = Swings and misses / Total pitches Zone% = Pitches in the strike zone / Total pitches Z-Contact% = Number of pitches on which contact was made on pitches inside the zone / Swings on pitches inside the zoneĬontact% = Number of pitches on which contact was made / Swings O-Contact% = Number of pitches on which contact was made on pitches outside the zone / Swings on pitches outside the zone Z-Swing% = Swings at pitches inside the zone / pitches inside the zone O-Swing% = Swings at pitches outside the zone / pitches outside the zone The PITCHf/x numbers are raw PITCHf/x data, while the BIS numbers have been modified by human coders so they will not always be in perfect agreement and are subject to some measurement error. Please remember that we have data for these from two different sources. There are many statistics that fit into the category of “plate discipline,” and the basic definitions are provided below. These numbers are very useful for determining the type of hitter or pitcher at which you’re looking and changes in these numbers can often be indicative of underlying changes in a player’s approach.
We host a variety of plate discipline statistics on the site and draw from two separate data sources (Baseball Info Solutions and PITCHf/x). Plate Discipline statistics tell us how often a hitter swings and makes contact with certain kinds of pitches or how often a pitcher induces swings or contact on certain kinds of pitches.
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