FanGraphs Library Stat Glossary by Piper Slowinski December 18, 2012 To find a particular statistic, use Ctr-F and type in the abbreviation or stat name that you are looking for. Offense: OBP – On-Base Percentage OPS – On-base Plus Slugging OPS+ – On-base Plus Slugging Plus wOBA – Weighted On-Base Average wRAA – Weighted Runs Above Average UBR – Ultimate Base Running wRC – Weighted Runs Created wRC+ – Weighted Runs Created Plus BABIP – Batting Average on Ball In Play ISO – Isolated Power HR/FB – Home Runs per Fly Ball rate Spd – Speed Score GB% – Ground ball percentage FB% – Fly ball percentage LD% – Line drive percentate K% – Stikeout rate BB% – Walk rate O-Swing% – Outside-the-zone swing rate Z-Swing% – Inside-the-zone swing rate Swing% – Swing rate O-Contact% – Outside-the-zone contact percentage Z-Contact% – Inside-the-zone contact percentage Contact% – Contact percentage Zone% – Percentage of pitches within the zone F-Strike% – First-pitch strike percentage SwStr% – Swinging Stike percentage wFB – Fastball runs above average wSL – Slider runs above average wCT – Cutter runs above average wCB – Curveball runs above average wCH – Change-up runs above average wSF – Split-finger fastball runs above average wKN – Knuckleball runs above average wFB/C – Fastball runs above average per 100 pitches wSL/C– Slider runs above average per 100 pitches wCT/C – Cutter runs above average per 100 pitches wCB/C – Curveball runs above average per 100 pitches wCH/C – Change-up runs above average per 100 pitches wSF/C – Slit-fingered fastball runs above average per 100 pitches wKN/C – Knuckleball runs above average per 100 pitches Defense: rSB – Stolen Base Runs Saved runs above average rGDP – Double Play Runs Saved runs above average rARM – Outfield Arms Runs Saved runs above average rGFP – Good Fielding Plays Runs Saved runs above average rPM – Plus/Minus Runs Saved runs above average DRS – Defensive Runs Saved runs above average BIZ – Balls In Zone OOZ – Balls Out Of Zone RZR – Revised Zone Rating CPP – Expected Catcher Passed Pitches RPP – Catcher Blocked Pitches in runs above average TZ – Total Zone TZL – Total Zone with Location data FSR – Fan Scouting Report ARM – Outfield Arm runs above average DPR – Double Play runs above average RngR – Range runs above average ErrR – Error runs above average UZR – Ultimate Zone Rating UZR/150 – Ultimate Zone Rating per 150 defensive games Pitching: ERA – Earned Run Average WHIP – Walks and Hits per Innings Pitched FIP – Fielding Independent Pitching xFIP – Expected Fielding Independent Pitching SIERA – Skill-Interactive ERA tERA – True Runs Allowed K/9 – Strikeout rate BB/9 – Walk rate K% – Strikeout percentage BB% – Walk percentage K/BB – Strikeout-to-Walk ratio LD% – Line drive rate GB% – Ground ball rate FB% – Fly ball rate HR/FB – Home runs per fly ball rate BABIP – Batting Average on Balls In Play LOB% – Left On Base percentage ERA- – ERA Minus FIP- FIP Minus xFIP- – xFIP Minus SD – Shutdowns MD – Meltdowns O-Swing% – Outside-the-zone swing rate Z-Swing% – Inside-the-zone swing rate Swing% – Swing rate O-Contact% – Outside-the-zone contact percentage Z-Contact% – Inside-the-zone contact percentage Contact% – Contact percentage Zone% – Percentage of pitches within the zone F-Strike% – First-pitch strike percentage SwStr% – Swinging Stike percentage wFB – Fastball runs above average wSL – Slider runs above average wCT – Cutter runs above average wCB – Curveball runs above average wCH – Change-up runs above average wSF – Split-finger fastball runs above average wKN – Knuckleball runs above average wFB/C – Fastball runs above average per 100 pitches wSL/C– Slider runs above average per 100 pitches wCT/C – Cutter runs above average per 100 pitches wCB/C – Curveball runs above average per 100 pitches wCH/C – Change-up runs above average per 100 pitches wSF/C – Slit-fingered fastball runs above average per 100 pitches wKN/C – Knuckleball runs above average per 100 pitches Win Probability: WPA – Win Probability Added -WPA – Loss Advancement +WPA – Win Advancement RE24 – Run Above Average based on the 24 Base/Out States REW – Wins Above Average based on the 24 Base/Out States pLI – A player’s average LI for all game events phLI – A batter’s average LI in only pinch hit events PH – Pinch Hit Opportunities gmLI – A pitcher’s average LI when he enters the game inLI – A pitcher’s average LI at the start of each inning exLI – A pitcher’s average LI when exiting the game WPA/LI – Situational Wins Clutch – How much better or worse a player does in high leverage situations than he would have done in a context neutral environment WAR Offensive Batting – Park Adjusted Runs Above Average based on wOBA Base Running – Base running runs above average, includes SB or CS Fielding – Fielding Runs Above Average based on UZR (TZ before 2002) Replacement – Replacement Runs set at 20 runs per 600 plate apperances Positional – Positional Adjustment set at +12.5 for C, +7.5 for SS, +2.5 for 2B/3B/CF, -7.5 for RF/LF, -12.5 for 1B, -17.5 for DH Fld + Pos RAR – Runs Above Replacement (Batting + Fielding + Base Running + Replacement + Positional) WAR – Wins Above Replacement Pitching RA9-Wins – Wins Above Replacement calculated using Runs Allowed BIP-Wins – BABIP wins above average LOB-Wins – Sequencing in wins above average (calculated as the difference between RA9-Wins and WAR minus BIP-Wins) FDP-Wins – BABIP and Sequencing wins above average, also the difference between RA9-Wins and WAR RAR – Runs Above Replacement WAR – Wins Above Replacement