基礎知識

wRAA(weighted Runs Above Average)




シーズンのwRAAランキングはこちらから

概要

同じ打席数をリーグの平均的な打者が打つ場合に比べてどれだけチームの得点を増やしたか、または減らしたかを表す打撃指標。平均的な打者であればゼロとなり、平均より優れた打者では正の値、平均より劣る打者では負の値となる。wRAAが10であれば、理論的にはその打者が打つことによって同じ打席数を平均的な打者が打つ場合に比べてチームの得点が10点増えたと評価できる。


計算式


wRAA=(wOBA-リーグ平均wOBA)÷1.24×打席

背景

wOBAは打者の働きを打席あたりの「率」の形で表す評価指標であり、その打撃によって得点数の意味でどれだけの利得がもたらされたのかを知ることはできない。そこで打席数も加味した上で利得の多さを表す形に変形したものがwRAAである。


例えばある打者のwOBAが.355で、リーグ平均wOBAが.330であるとすると、打席あたりでは (0.355-0.330)÷1.24=0.02 だけ平均的な打者に比べて得点を増やす打撃であることになる(wOBAscaleと呼ばれる1.24の数字で割るのはwOBAの係数が得点価値よりもそれだけ大きくされているため。詳細はwOBAの「背景」項目を参照)。この打者が500打席に立っていれば0.02に500を掛けた10点分、チームの得点に上積みをもたらしたと評価できる。600打席であれば12点である。


すなわち一般的に言ってwRAAが高い打者というのは、打席あたりで見て平均的な打者よりも優れた打撃をしており、かつ出場した打席数も多いような打者であることとなる。wOBAがリーグ平均以下の打者であれば、wRAAは負の値となる。


打者の貢献度を評価する際、その打者によってどれだけ得点の優位性がもたらされたかを知ることができ大変有用な指標である。wRAAは総合評価指標WARを計算する上で打撃評価の基礎にもなっている[1]。


なお平均との差分ではなく、同じ打席数で平均的な打者が創出する分も足し合わせて「創出した総得点」を表す形に変換したのがwRCである。



シーズンのwRAAランキングはこちらから

[1]WAR算出時のパーツとなるOffenceはwRAAとイコールではない。wRAAがリーグ平均の打者を基準にしているのに対し、Offenceはリーグ平均の野手を基準としている点、また球場補正を施している点で異なる。

指標一覧

指標右側のタグは"Leaders" 内のテーブルにリンクされています。Batting > Standard と表示されていた場合、"Leaders"メニュー内の"Batting""Standard" のテーブルにリンクされています。
1B
One-base Hit
Batting > Standard
2B
Two-base Hit
Batting > Standard
3B
Three-base Hit
Batting > Standard
AVG
Batting Average
Batting > Standard
AVG
Batting Average
Batting > Advanced
AVG
hits allowed average
Pitching > Advanced
BABIP
Batting Average on Balls In Play
Batting > Advanced
BB
Base on Ball
Batting > Standard
BB
walks and given
Pitching > Standard
BB/K
walk-to-strikeout ratio
Batting > Advanced
BUH%
bunt hit percentage
Batting > Batted Ball
CG
complete game
Pitching > Standard
CS
Caught Stealing
Batting > Standard
CS
caught stealing
Pitching > Standard
ERA
earned run average
Pitching > Standard
exLI
Average Leverage Index when exiting the game
Pitching > Win Probability
FB%
fly ball percentage
Batting > Batted Ball
FB%
fly ball percentage
Pitching > Batted Ball
FT%
Two Seam Fastball percentage
Batting > Pitch Type
FT%
Two Seam Fastball percentage
Pitching > Pitch Type
FTv
Two Seam Fastball velocity
Batting > Pitch Type
FTv
Two Seam Fastball velocity
Pitching > Pitch Type
GB%
ground ball percentage
Batting > Batted Ball
GB%
ground ball percentage
Pitching > Batted Ball
GB/FB
ground ball to fly ball ratio
Batting > Batted Ball
GB/FB
ground ball to fly ball ratio
Pitching > Batted Ball
GBOut%
ground ball out percentage
Batting > Batted Ball
GDP
Grounded into Double Play
Batting > Standard
gmLI
Average Leverage Index when entering the game
Pitching > Win Probability
HBP
Hit By Pitch
Batting > Standard
HBP
hit by pitch
Pitching > Standard
HR
home runs allowed
Pitching > Standard
IBB
Intentional Base on Ball
Batting > Standard
IBB
intentional base on balls
Pitching > Standard
IFFB%
infield fly ball percentage
Batting > Batted Ball
IFFB%
infield fly ball percentage
Pitching > Batted Ball
IFH%
infield hit percentage
Batting > Batted Ball
inLI
Average Leverage Index at the start of the inning
Pitching > Win Probability
IP
innings pitched
Pitching > Standard
K%
strikeouts rate
Batting > Advanced
K-BB%
strikeout-walk rate differential
Pitching > Advanced
LD%
line drive percentage
Batting > Batted Ball
LD%
line drive percentage
Pitching > Batted Ball
OBP
On-Base Percentage
Batting > Advanced
O-Contact%
Z-Contact%
Contact%
contact percentage
Batting > Plate Discipline
O-Contact%
Z-Contact%
Contact%
contact percentage
Pitching > Plate Discipline
OFOut%
outfield fly out percentage
Batting > Batted Ball
OPS
On-base Plus Slugging percentage
Batting > Advanced
O-Swing%
Z-Swing%
Swing%
SwStr%
swing percentage
Batting > Plate Discipline
O-Swing%
Z-Swing%
Swing%
SwStr%
swing percentage
Pitching > Plate Discipline
PA
Plate Appearance
Batting > Standard
PH
Pinch Hit Opportunities
Batting > Win Probability
PhLI
Average Leverage Index while Pinch Hitting
Batting > Win Probability
pLI
Player Average Leverage Index
Batting > Win Probability
pLI
Player Average Leverage Index
Pitching > Win Probability
Pull%
Cent%
Oppo%
batted ball direction
Batting > Batted Ball
Pull%
Cent%
Oppo%
batted ball direction
Pitching > Batted Ball
R
runs allowed
Pitching > Standard
RBI
Runs Batted In
Batting > Standard
RE24
Run Above Average based on the 24 Base/Out States
Batting > Win Probability
RE24
Run Above Average based on the 24 Base/Out States
Pitching > Win Probability
REW
Wins Above Average based on the 24 Base/Out States
Batting > Win Probability
REW
Wins Above Average based on the 24 Base/Out States
Pitching > Win Probability
SB
Steal a Base
Batting > Standard
SB
steal a base
Pitching > Standard
SF
Sacrifice Fly
Batting > Standard
SH
Sacrifice Hit
Batting > Standard
SLG
Slugging percentage
Batting > Advanced
SO
Strike Out
Batting > Standard
Soft%
Mid%
Hard%
quality of contact stats
Batting > Batted Ball
Soft%
Mid%
Hard%
quality of contact stats
Pitching > Batted Ball
TBF
total batters faced
Pitching > Standard
WAR
wins above replacement
Batting > Value
WAR
WAR
wins above replacement
Pitching > Value
WAR
wCB/C
Curveball runs above average per 100 pitches
Batting > Pitch Value
wCB/C
Curveball runs above average per 100 pitches
Pitching > Pitch Value
wCH/C
Changeup runs above average per 100 pitches
Pitching > Pitch Value
wCT/C
Cutter runs above average per 100 pitches
Pitching > Pitch Value
wFA/C
Fastball runs above average per 100 pitches
Batting > Pitch Value
wFA/C
Fastball runs above average per 100 pitches
Pitching > Pitch Value
wFT
Two Seam Fastball runs above average
Batting > Pitch Value
wFT
Two Seam Fastball runs above average
Pitching > Pitch Value
wFT/C
Two Seam Fastball runs above average per 100 pitches
Batting > Pitch Value
wFT/C
Two Seam Fastball runs above average per 100 pitches
Pitching > Pitch Value
WP
wild pitch
Pitching > Standard
wSB
weighted Stolen Base runs
Batting > Advanced
wSF/C
Splitter runs above average per 100 pitches
Batting > Pitch Value
wSF/C
Splitter runs above average per 100 pitches
Pitching > Pitch Value
wSI/C
Sinker runs above average per 100 pitches
Batting > Pitch Value
wSI/C
Sinker runs above average per 100 pitches
Pitching > Pitch Value
wSL/C
Slider runs above average per 100 pitches
Batting > Pitch Value
wSL/C
Slider runs above average per 100 pitches
Pitching > Pitch Value
wSP/C
Special runs above average per 100 pitches
Batting > Pitch Value
wSP/C
Special runs above average per 100 pitches
Pitching > Pitch Value
Zone%
F-Strike%
pitches in the strike zone percentage
Batting > Plate Discipline
Zone%
F-Strike%
pitches in the strike zone percentage
Pitching > Plate Discipline
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