Age. Age on July 1st of a given year.
Batting Average. Calculated by H/AB
Batting Average on Balls In Play. The percentage of hits on balls in play. Calculated by (H-HR)/(AB-K-HR-SF)
It’s mostly true that pitchers have little control over their balls in play, so if a pitcher is too far from the league average BABIP his performance is likely going to regress to the mean. However, one reliable way a pitcher has to control his BABIP is by inducing popups. Since popups have the same result as a strikeout 99% of the time (batter is out, runners can’t advance) BABIP-IFB treats popups the same as a strikeout, and removes them from the denominator of BABIP.
Percentage of plate appearances ending in a walk
Walks Per Nine Innings
Balls In Play
Number of balls bunted into play.
Percentage of balls bunted into play.
Contact Percentage. Percentage of swings a batter makes contact on.
Earned Run Average. Calculated by ER/IP*9
Fielding Independent Pitching. A stat that measures everything a pitcher can control, then adjusts that on a scale similar to ERA. Intended to measure how well a pitcher pitched, regardless of the defense behind him. Calculated by ((HR*13+(BB+HBP-IBB)*3-K*2)/IP)+3.2
Game Score. Developed by Bill James to determine the strength of a starting pitcher during a game. Calculated by starting at 50 points, adding a point for every out recorded, two points for every inning finished passed the fourth, and one point for every strike out. You then subtract two points for every hit allowed, four points for each earned run, two points for each unearned run, and one point for each walk
Ground Ball Percentage. The percentage of balls in play that are ground balls
Ground Ball To Fly Ball Ratio. Infield and outfield flies are included in fly balls
Hits Per Nine Innings
Hit By Pitch
Home Runs Per Nine Innings
Percentage of balls a batter puts into play that become home runs. Does not include bunts.
The percentage of outfield fly balls that become home runs
Infield Fly Balls.
Infield Fly Ball Percentage. The percentage of balls in play that are fly balls to the infield
Isolated Power. Slugging Percentage – Batting Average
Strike out to at bat ratio.
Strike out to walk ratio.
Percentage of plate apperances ending in a strike out
Unknown Strikeout Type
Strike Outs Per Nine Innings
Strike Outs Looking
Strike Outs Swinging to Strike Outs Looking Ratio
Strike Outs Swinging
Line Drives Hit.
Line Drive Percentage. The percentage of balls in play that are line drives
Number of Pitches
Percentage of time a player makes contact when he swings at a ball outside the strike zone.
On Base Percentage. Calculated by (H+BB+HBP)/(AB+BB+HBP+SF)
Outfield Fly Balls.
Outfield Fly Ball Percentage. The percentage of balls in play that are fly balls to the outfield
On Base Pecentage Plus Slugging Percentage
Percentage of balls swung at outside the strike zone
Pitches Per Plate Apperance
A method to calculate a teams expected record based on the number of runs they scored and allowed. Calculated by (Runs^1.81/(Runs^1.81+Runs Against^1.81) * Games to get pythagorean wins
Result – Win or Loss
Reached On Error
Runs Batted In
Slugging Percentage. Calculated by TB/AB
Skill-Interactive Earned Run Average. Developed by Baseball Prospectus SIERA accounts for how run prevention improves as ground ball rate increases and declines as more whiffs are accrued, while grounders are of more materiality for those who allow a surplus of runners. The formula for SIERA is: SIERA = 6.145 Ð 16.986*(SO/PA) + 11.434*(BB/PA) Ð 1.858*((GB-FB-PU)/PA) + 7.653*((SO/PA)^2) +/Ð 6.664*(((GB-FB-PU)/PA)^2) + 10.130*(SO/PA)*((GB-FB-PU)/PA) Ð 5.195*(BB/PA)*((GB-FB-PU)/PA) where the +/- term is a negative sign when (GB-FB-PU)/PA is positive and vice versa.
Swings And Misses
Swing Percentage. Percentage of pitches swung at.
Swinging Strike Percentage. Percentage of strikes swung at.
Three true outcomes percentage. The percentage of time a plate appearance results in a strike out, walk, or home run.
Unknown Batted Ball. Plays where batted ball data is not available
Unknown Batted Ball Percentage. The percentage of balls in play with an unknown batted ball type.
Percentage of plate apperances ending in an unintentional walk
Whiff percentage. Swinging strikes per pitch thrown.
Whiff per swing percentage. Swinging strikes per pitch swung at. The inverse of the stat Con%
Walks and Hits per Inning Pitched.
Weighted on base percentage. A statistic based on linear weights designed to better capture what is important on offense. More on how we calculate wOBA here.
Percentage of time a player makes contact when he swings at a ball inside the strike zone.
Percentage of balls thrown in the strike zone
Percentage of balls swung at inside the strike zone