BBTF.org

- /micros

Why wOBA Works

Let’s say you have a player, let’s call him Al Trout, who has hit six singles in 10 plate appearances (making an out every other time) and the league, on average, hits three singles every 10 plate appearances (again, making an out every other time). To use linear weights to figure out how many more runs Al contributed above the league average, you’d…

Calculate the extra runs Al contributed by hitting more singles, which equals the difference in singles times the run value of a single, or (6-3) times 0.48, or 1.44. Then you’d…

Calculate the extra runs that Al contributed by making fewer outs, which equals the difference in outs made times the run value of an out, or (4-7) times -0.30 (that’s a negative 0.30), or 0.9. Then you’d…

Add the two together. 1.44 plus 0.9 equals 2.34. In his 10 plate appearances, Al contributed 2.34 runs more than the average player.

Okay, I have to add a technical footnote here. I have shown you this way of calculating linear weights because it will make it easier to understand the wOBA formula But, in reality, you only have to multiply Al’s singles and outs by the appropriate linear weights of that league and year to calculate the number of runs he contributed above average.Anyway, that’s the hard linear weights way to calculate the difference. Here’s the wOBA way:

Multiply the difference in singles times the wOBA multiplier, or (6-3) times 0.78, or 2.34.

That’s it; one simple step. wOBA shows that Al contributed 2.34 runs more than the average player, the same outcome as the linear weights.

Why does this happen? Because wOBA weights include the impact of the hit AND the impact of turning an out into a hit. When you keep the number of plate appearances even, you’re not just adding a hit to the hit total. You’re also reducing an out from the out total. wOBA captures the impact of both event changes.

wOBA fundamentally works because it is a rate stat. Its divisor is plate appearances. When you compare two players’ wOBA you have equalized their total plate appearances.

Thanks to **Los**.

Login to Join (8 members)

{/exp:tag:subscribed}Cameron: The Stealth MVP Candidacy of Hunter Pence

(49 -*10:26am, Sep 22)*

Last: What did Billy Ripken have against ElRoy Face?

Rudman: Clutch hitting the key to Mariners’ playoff hopes

(10 -*12:09am, Sep 18)*

Last: madvillain

Kapler: Baseball’s next big competitive edge

(83 -*8:45pm, Sep 15)*

Last: McCoy

Kevin Frandsen doesn’t need ‘all the sabermetric-whatever-crap’

(16 -*9:03am, Sep 05)*

Last: Rusty Priske

Spencer: Trout, Donaldson rival leaders on the WAR path

(10 -*2:50pm, Aug 31)*

Last: Tom Nawrocki

Sullivan: Why Mike Trout -- and the rest of the league -- is having trouble with the high stuff

(7 -*12:22pm, Aug 31)*

Last: Rickey! trades in sheep and threats

Daily Orange: Beyond the box score—SU club uses statistics to further baseball knowledge

(14 -*12:34pm, Aug 27)*

Last: Lance Reddick! Lance him!

MGL: Which teams are optimizing their lineups?

(73 -*9:48pm, Aug 24)*

Last: McCoy

Sabermetrics Gets Soft «

(6 -*9:54am, Aug 21)*

Last: What did Billy Ripken have against ElRoy Face?

BP: Moonshot: The Analytic Value of the Crack of the Bat

(7 -*6:08pm, Aug 20)*

Last: dr. scott

Neyer: Grains of salt

(52 -*9:58pm, Aug 19)*

Last: PreservedFish

Sam Miller: The beauty (in the eye of the beholder) of the Strikeout Era

(3 -*9:33pm, Aug 19)*

Last: Hank G.

Brisbee: Jedd Gyorko's 31 homers isn't the saddest team record

(12 -*4:16pm, Aug 19)*

Last: Moeball

Retrosheet: Soper-Understanding The Value of the Next Run. Why Sabermetricians Are Wrong and Traditional Baseball is Right

(61 -*2:02pm, Aug 18)*

Last: McCoy

Sullivan: Going inside Michael Brantley's dramatic, MVP-like improvement

(12 -*6:58pm, Aug 16)*

Last: cardsfanboy

(49 -

Last: What did Billy Ripken have against ElRoy Face?

Rudman: Clutch hitting the key to Mariners’ playoff hopes

(10 -

Last: madvillain

Kapler: Baseball’s next big competitive edge

(83 -

Last: McCoy

Kevin Frandsen doesn’t need ‘all the sabermetric-whatever-crap’

(16 -

Last: Rusty Priske

Spencer: Trout, Donaldson rival leaders on the WAR path

(10 -

Last: Tom Nawrocki

Sullivan: Why Mike Trout -- and the rest of the league -- is having trouble with the high stuff

(7 -

Last: Rickey! trades in sheep and threats

Daily Orange: Beyond the box score—SU club uses statistics to further baseball knowledge

(14 -

Last: Lance Reddick! Lance him!

MGL: Which teams are optimizing their lineups?

(73 -

Last: McCoy

Sabermetrics Gets Soft «

(6 -

Last: What did Billy Ripken have against ElRoy Face?

BP: Moonshot: The Analytic Value of the Crack of the Bat

(7 -

Last: dr. scott

Neyer: Grains of salt

(52 -

Last: PreservedFish

Sam Miller: The beauty (in the eye of the beholder) of the Strikeout Era

(3 -

Last: Hank G.

Brisbee: Jedd Gyorko's 31 homers isn't the saddest team record

(12 -

Last: Moeball

Retrosheet: Soper-Understanding The Value of the Next Run. Why Sabermetricians Are Wrong and Traditional Baseball is Right

(61 -

Last: McCoy

Sullivan: Going inside Michael Brantley's dramatic, MVP-like improvement

(12 -

Last: cardsfanboy

HBT: Talking head says Jeter is “a fraud” and “you are all suckers”

(159 -*12:10pm, Sep 22)*

Last: GuyM

OMNICHATTER 9-22-2014

(20 -*12:08pm, Sep 22)*

Last: boteman is not here 'til October

MLB: Braves fire GM Frank Wren; John Hart to take over interim position

(9 -*12:06pm, Sep 22)*

Last: zonk

Calcaterra | The Padres are going to keep Bud Black as their manager for 2015

(4 -*12:00pm, Sep 22)*

Last: Into the Void

Corey Kluber strikes out 14 in second straight start

(4 -*11:55am, Sep 22)*

Last: RoyalsRetro (AG#1F)

OT: Politics, September, 2014: ESPN honors Daily Worker sports editor Lester Rodney

(3441 -*11:53am, Sep 22)*

Last: You Know Nothing JT Snow (YR)

OT: The Soccer Thread, September 2014

(361 -*11:51am, Sep 22)*

Last: ursus arctos

Young fan throws back Jeter foul

(4 -*11:50am, Sep 22)*

Last: boteman is not here 'til October

OT: Monthly NBA Thread - September 2014

(299 -*11:50am, Sep 22)*

Last: Mirabelli Dictu (Chris McClinch)

OT: NFL/NHL thread

(8041 -*11:37am, Sep 22)*

Last: steagles

OT August 2014: Wrassle Mania I

(208 -*11:22am, Sep 22)*

Last: Rowland Office Supplies

Primer Dugout (and link of the day) 9-22-2014

(12 -*10:53am, Sep 22)*

Last: Davo Dozier

Stephen Strasburg pitching like the Nationals’ Game 1 starter

(6 -*10:40am, Sep 22)*

Last: PASTE Thinks This Trout Kid Might Be OK (Zeth)

John Thorn: Fame & Fandom

(22 -*10:38am, Sep 22)*

Last: zonk

Cameron: The Stealth MVP Candidacy of Hunter Pence

(49 -*10:26am, Sep 22)*

Last: What did Billy Ripken have against ElRoy Face?

(159 -

Last: GuyM

OMNICHATTER 9-22-2014

(20 -

Last: boteman is not here 'til October

MLB: Braves fire GM Frank Wren; John Hart to take over interim position

(9 -

Last: zonk

Calcaterra | The Padres are going to keep Bud Black as their manager for 2015

(4 -

Last: Into the Void

Corey Kluber strikes out 14 in second straight start

(4 -

Last: RoyalsRetro (AG#1F)

OT: Politics, September, 2014: ESPN honors Daily Worker sports editor Lester Rodney

(3441 -

Last: You Know Nothing JT Snow (YR)

OT: The Soccer Thread, September 2014

(361 -

Last: ursus arctos

Young fan throws back Jeter foul

(4 -

Last: boteman is not here 'til October

OT: Monthly NBA Thread - September 2014

(299 -

Last: Mirabelli Dictu (Chris McClinch)

OT: NFL/NHL thread

(8041 -

Last: steagles

OT August 2014: Wrassle Mania I

(208 -

Last: Rowland Office Supplies

Primer Dugout (and link of the day) 9-22-2014

(12 -

Last: Davo Dozier

Stephen Strasburg pitching like the Nationals’ Game 1 starter

(6 -

Last: PASTE Thinks This Trout Kid Might Be OK (Zeth)

John Thorn: Fame & Fandom

(22 -

Last: zonk

Cameron: The Stealth MVP Candidacy of Hunter Pence

(49 -

Last: What did Billy Ripken have against ElRoy Face?

Page rendered in 0.2967 seconds, 57 querie(s) executed

## Reader Comments and Retorts

Go to end of page

1. Walt Davis posted on April 21, 2014 at 06:09 PM #Statements posted here are those of our readers and do not represent the BaseballThinkFactory. Names are provided by the poster and are not verified. We ask that posters follow our submission policy. Please report any inappropriate comments.You must be Registered and Logged In to post comments.