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Glossary of Pitching Statistics Hitting | Fielding



Linear Weights  KLWTS=

             H-HR
BIP%
=  --------     Opponent's batting average on Balls Put In Play
         
3*IP-SO-DP

BIP% vs Team
= BIP%-Team BIP% A pitcher's ability to prevent hits on Balls Put In Play,                                                          independent of team defense.

              
PA ERA
ERA+
=   ---------  * 100   A player's ERA Park Adjusted and compared to the league average
              Lg ERA

FIP% - Fielding Independent Pitching - (HR*13+(BB-IBB+HB)*3-K*2)/IP + F

Where F is a league-dependent factor used to make the stat resemble ERA. The 2006 factors are 3.22-NL and 3.26-AL.

                        ERA+         Simpler and more accurate than PR in accounting for a pitcher's
IP*ERA+ = IP * (  ------ - 1 )   longevity and effectiveness.  In my Top 100 List, I divide it by 3 to  
                         100           make it close to DPOR, allowing for good hitter/pitcher comparisons.


        
BB+SO+3*HR
P%
=    ---------           Rough percentage of a team's defense made up by ONLY pitchers
   
      BB+H+3*IP

             Regular Season ERA
PERA+     --------------------------  * 100
Measures how much a pitcher stepped up or
         
      Postseason ERA                choked during the playoffs.

PLWTS - .47*1B + .78*2B + 1.09*3B + 1.4*HR + .33*(BB+HB) - .26*(AB-H-GIDP)-.72*GIDP

In our Pitcher Stats section, we do not include stolen base data in our calculation. This is primarily because we do not have it handy, although it could be a blessing in disguise as many pitchers don't have a huge effect on basestealing effectiveness.

       IP
PR
=  --- * (Lg ERA- ERA)  Pitching Runs- Runs saved beyond what a league average pitcher
        9                                                      would save.

PR+ Adjusted Pitching Runs- Pitching Runs adjusted for home ballpark effects

Park = PR - PR+  Quantifies the home ballpark effect for a pitcher's entire career:
                          Positive = Pitcher's Parks, Negative = Hitter's Parks

                
R-ER
UER/IP
= -------     Unearned runs allowed per inning pitched
                
 IP

WAT Original Formula:

WAT
= Decisions * (Pitcher W%-Team W%)    Wins Above Team

Total Baseball jazzed it up for reasons that I do not find clear:

WAT= Decisions * (Pitcher W%-Team W%)
                   -----------------
                  2 - 2 * Team W%

WAT/D
= Pitcher W% - Team W%   Allows for career "ability to win" comparisons between players                                                       with disparate career innings pitched.
 

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