Glossary: Defense
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Assists.
The number of equivalent runs allowed by a team, adjusted for the quality of their opponent's offense.
The estimated number of real, nine-inning games played at this position.
The percentage of double play opportunities turned into actual double plays by a pitcher or hitter.
Def Eff, or Defensive Efficiency, is the rate at which balls put into play are converted into outs by a team's defense. Def Eff can be approximated with (1 - BABIP), if all you have is BABIP, but a team's actual Def Eff is computed with
1 - ((H + ROE - HR) / (PA - BB - SO - HBP - HR))
the Team Audit Standings use the latter formula.
Errors.
Equivalent Runs allowed by a team.
Fielding Runs Above Average.
Fielding Runs Above Replacement. The difference between an average player and a replacement player is determined by the number of plays that position is called on to make. That makes the value at each position variable over time. In the all-time adjustments, an average catcher is set to 39 runs above replacement per 162 games, first base to 10, second to 29, third to 22, short to 33, center field to 24, left and right to 14.
Fielding runs above replacement. A fielding statistic, where a replacement player is meant to be approximately equal to the lowest-ranking player at that position, fielding wise, in the majors. Average players at different positions have different FRAR values, which depend on the defensive value of the position; an average shortstop has more FRAR than an average left fielder.
See FRAR, FRAR2. FRAR2 incorporates adjustments for league difficulty and normalizes defensive statistics over time.
Hits, or hits allowed.
Putouts.
Player's position.
Reached On Error: when a batter reaches first base as a direct result of a fielding error.
Percentage of plate appearances that result in the batter reaching base on an error.
A way to look at the fielder's rate of production, equal to 100 plus the number of runs above or below average this fielder is per 100 games. A player with a rate of 110 is 10 runs above average per 100 games, a player with an 87 is 13 runs below average per 100 games, etc.
See Rate. Rate2 incorporates adjustments for league difficulty and normalizes defensive statistics over time.
Simple Fielding Runs -- The runs above average contributed by a defender. SFR is a defensive metric currently in a "beta" form based on Retrosheet-style play by play data. SFR for infielders is calculated differently than that for outfielders and for outfielders the metric is park-adjusted.
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