Navigation: Jump to content areas:


Pro Quality. Fan Perspective.
Login-facebook
Around SBN: Knicks Beat Lakers With Familiar Strategy

Graph of the Day: Wang's Spin Movement at Home

Wang3_medium

If you're saying Chien-Ming Wang's sinker has lost many inches of movement, you'll also have to say he used a screwball in 2008.  Or you can just say that Yankee Stadium was wrong in 2007, adjusted too much for 2008, and again at the new park in 2009.  Based on the slider movement, it's still off. 

That makes it hard to tell what's changed with Wang without adjusting the base data.  That includes the release points, the initial acceleration and velocity values.

Bonus graph: lateral acceleration (ax) from Yankee Stadium(s) from 2007 thru 2009.

Wang4_medium

Comment 9 comments  |  0 recs  | 

Do you like this story?

Comments

Display:

What is lateral acceleration

St. Louis Cardinals... defying win expectancy since 2008

by vivaelpujols on May 30, 2009 4:15 PM EDT reply actions  

Sidways movement, sort of.

Not measured in absolute distance moved, but instead the amount of sideways acceleration caused by the force caused by spin.

Beyond the Boxscore // Calling BJ Upton lazy is lazy.

by Sky Kalkman on May 30, 2009 5:05 PM EDT up reply actions  

Gotcha

St. Louis Cardinals... defying win expectancy since 2008

by vivaelpujols on May 30, 2009 5:12 PM EDT up reply actions  

Can't just be Wang with how many data points there are.

Pretty sure each vertical line of dots is one game or one start.

Beyond the Boxscore // Calling BJ Upton lazy is lazy.

by Sky Kalkman on May 30, 2009 5:19 PM EDT up reply actions  

Not quite

It’s the rate of change of speed in the lateral direction (x-axis in pitchf/x). Magnus force causes spin movement. Based on where the PITCHf/x system thinks the release point, and where it’s going in the initial flight, the acceleration values are estimated and used , along with velocity and location, to create the estimated path of the pitch. If the cameras are off, the initial values will be off to force the ball on path to home plate. Ike Hall has some coherent work on the topic. I’m just an unfrozen caveman baseball nerd.

by Harry Pavlidis on May 30, 2009 6:43 PM EDT up reply actions  

Comments For This Post Are Closed


User Tools

We use numbers and stuff.
Community Guidelines
Why be a member?

FanPosts

Community blog posts and discussion.

Recent FanPosts

Crystal_ball_small
Sparky vs Buck
Img_3830_small
BtBS Fantasy League
Small
Context Neutral Run and RBI projections
Small
Free Agent Compensation
Img_0001_small
Value of Various Plate Approaches
Strike_three2_small
Effect of Foul Area on Strikeouts: AL 1954-68: Erratum
Small
Baseball on a stick
Small
Player Evaluating Statistic
Baseball_small
Rays Outfield: Cheap but Extremely Productive
Small
A new xBABIP

+ New FanPost All FanPosts >

Follow us on Facebook!

Follow us on Twitter!

SaberGraphics

MLB Daily Dish

Get the latest MLB Trade Rumors, Transactions, and News at MLB Daily Dish!


Managing Editor:

Jbopp-kc_small Justin Bopp

Columnists:

Adam_small adarowski

Dme_small Satchel Price

Closeup4_small J-Doug

Carlosicon_small Julian Levine

Billy_and_daddy_4th_of_july_small Bill Petti

Featuring:

Dayton_small Jeff Zimmerman

12475953_small Jacob Peterson

Picture-6_small Chris St. John

Btbpro_small Dave Gershman

229331_10150183361996591_674441590_6760167_6637860_n3_small Lewie Pollis

Img_3830_small David Fung