GLOSSARY

*NB: data for this site is compiled from Major League Baseball's play-by-play files.*

1B |
2B |
3B |
AB |
Ahd |
AVG |
batV |
BB |
BF |
Bhd |
Btd |
Cont |
Ct% |
Evn |
FB% |
FIP |
GB% |
GIDP |
H |
HBP |
HR |
HR/OF |
IF% |
IP |
K% |
kL% |
kS% |
LD% |
Lev |
nB% |
OBP |
oCt |
OPS |
oSw |
oTkS |
PA |
paV |
pFB |
Pitch |
posV |
P/PA |
RAA |
RBBIP |
ROE |
rv600 |
Sac |
SLG |
SO |
SO% |
Str% |
Swg |
SwS% |
wOBA |
wOBA+ |
wOBA* |
xHR |
xIP |
xR |
xRA |
xRA+ |
zCt |
Zone |
zTkB |
zSw |

The percentage of pitches thrown / seen in a count favorable to the player. Defined for pitchers as 0-1, 0-2, 1-2 and 2-2 counts. For hitters it is 1-0, 2-0, 3-0 and 3-1 counts.

Stands for batting value. It is determined by taking the player's park-adjusted wOBA and subtracting away the league average wOBA, and then dividing that by 1.15 and multiplying by the number of plate appearances the batter has had.

The percentage of pitches thrown / seen in a count deemed even. Defined as 0-0, 1-1, 2-1 and 3-2 counts.

Stands for Fielding Independent Pitching, a more simplistic version of xRA's goals. It is (13*HR + 3*(BB+HBP) - 2*(SO)) / IP + a constant, usually around 3.2.

The percentage of strikeouts resulting from a swing and a miss (pitcher) or the percentage of plate appearances ending in a swinging strikeout (batter).

The percentage of batters faced / plate appearances that resulted in either an unintentional walk or hit batter.

Stands for plate appearance value. It is used to give credit to the hitter for the difference between average and replacement level for those that wish to use a WAR-style calculation. The difference is set to 20 runs per 600 PAs.

Stands for position value. It gives credit for the position that the player plays, but

**not**his quality of play there. That is, this is not about how well a player plays defense, merely where a player plays defense. The values per full season (defined as 5,850 defensive PAs [150 games x 39 PAs per game]) are: +12.5 for catcher, +7.5 for shortstop, +2.5 for second base, third base and center field, -7.5 for left and right field, -12.5 for first base and -17.5 for designated hitter.
The percentage of balls in play (i.e. not including home runs), that result in the batter reaching base, either via hit or error.

wOBA or weighted on base average is a statistic developed by and used with the permission of Tom Tango. He gives a detailed rundown of it here. In a nutshell, wOBA uses linear weights on certain batting events to come up with a metric that is scaled onto an OBP scale.

The expected number of home runs allowed or hit based on the park factors and the distribution of batted balls.

The expected number of innings pitched, it is expected outs from the xRA calulations divided by 3 .

Stands for expected Run Average. xRA assigns run and out values to events under a pitcher's control and then constructs a run average using expected runs divided by expected outs multipled by 27, the same scale as the more common ERA or RA. See here for more detail

Like wOBA+. xRA+ is equal to the player's xRA subtracted from league's xRA and then divided by the league's xRA. That is then added to one and then multiplied by 100. As a formula it is: ( ( ( league xRA - player xRA ) / league xRA ) + 1 ) * 100.

The percentage of pitches with locations recorded landing within the typically called strike zone as defined by pitch F/X. The dimensions of the typically called strike zone vary.