Minor League Splits glossary

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Batting stats

Most of the batting statistics are self-explanatory. The following may be less familiar:

OPS: On-base percentage (OBP) Plus Slugging percentage (SLG).

BABIP: Batting Average on Balls In Play. This is calculated as follows: (H-HR)/(AB-K-HR). It is often used as a measure of luckiness, especially for pitchers. Most BABIPs eventually settle in the .280 - .310 range, so a batter with a BABIP much above that may be getting lucky, while a pitcher with a BABIP above that may be very unlucky.

Batted Ball Types. The last six categories provide batted-ball data (for both outs and hits), as follows:

  • G: Ground balls
  • L: Line drives
  • F: Fly Balls
  • P: Pop flies
  • B: Bunts
  • U: Unknown. Most of the time, a batted-ball type is unknown when a play results in an error on an outfielder. I assume that most unknowns are line drives or fly balls, but the number is small enough to remain fairly unimportant.

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Pitching stats

Many of the pitching statistics are familiar and self-explanatory. Some of the others, not so much:

Note about IP: Innings Pitched is a somewhat strange stat for some situational statistics, like saying that someone pitched "12 innings with the bases loaded." That IP total should be viewed as a reflection of the number of outs recorded in at-bats that fall into that category. Thus, a strikeout with the bases loaded accounts for 1/3 of an inning toward the 12 in the example above, while a GIDP with the bases loaded counts as 2/3 of an inning, as two outs were recorded on that play.

AVG, OBP, SLG: These are all "against" stats, so AVG indicates the batting average against that pitcher. They are all calculated using "at-bats against," not IP, for greater precision. (AB is not included in the tables for space reasons.) Also, SF are included in the calculation of OBP, even though they are not included in the table.

OPS: On-base percentage against (OBP) Plus Slugging percentage against (SLG).

BABIP: Batting Average on Balls In Play. This is calculated as follows: (H-HR)/(AB-K-HR). It is often used as a measure of luckiness, especially for pitchers. Most BABIPs eventually settle in the .280 - .310 range, so a batter with a BABIP much above that may be getting lucky, while a pitcher with a BABIP above that may be very unlucky.

WHIP: Walks plus hits divided by IP. This is a general measure of how many baserunners the pitcher allows.

K/9, W/9, HR/9: Strikeouts, Walks, and Home Runs per nine innings.

Batted Ball Types. The last six categories provide batted-ball data (for both outs and hits), as follows:

  • G: Ground balls
  • L: Line drives
  • F: Fly Balls
  • P: Pop flies
  • B: Bunts
  • U: Unknown. Most of the time, a batted-ball type is unknown when a play results in an error on an outfielder. I assume that most unknowns are line drives or fly balls, but the number is small enough to remain fairly unimportant.

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