## FanGraphs Library Stat Glossary

*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

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Is there quality starts available?

I think it’s time to update this stat glossary page because it appears there are a lot of new stats showing up in the charts.

This glossary needs a few additions it seems. If the fangraphs staff could, it’d be great to see an quick update. For one example, when looking at Pitcher > Game Logs,

LIis defined, butREandWEare not.REcankind ofbe inferred from theRE24definition, but there are so many abstract metrics on this site (which ILOVE, btw), it can be confusing. One idea that’s pretty easy to code — when you hover your pointer over a metric, there’s typically a link to sort by that stat. You could include the name that the acronym or abbreviation represents as a ‘title,’ with the link to sort underneath. For example, hovering overLIwould say:Leverage Indexclick here to sort

Just a thought, and pretty easy to implement. Plus you wouldn’t have to link to a definition, because just the

namewould be enough for someone to copy > paste into google and find the definition elsewhere.what is rs/9 and e-f for pitchers?

Also, support the addition for QS, as rudimentary as it is. What I’ve done for this is develop an IF function (if IP =>6 and ER <= 3) from what i export from fangraphs to help me calculate it.

You’ve got a couple unfortunate typos, where “split-fingered” is written “slit-fingered”.

What is BsR?

It’s listed in the Dashboard but doesn’t appear in the Glossary.

Also, Off and Def?