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Monday, February 28, 2011

Visual baseball: visualizing game score

Posted by Kevin Dame
Here's a way to visualize a pitcher's season using Bill James' Game Score stat. I found that shapes were more revealing than a simple line graph and I was able to spot patterns more easily. Here are a few pitchers from 2010:

Roy Halladay: I was struck by the weirdly repeatable pattern he had in the first half of the season. Maybe he's some sort of a cyborg or robot and trying to cover it up with intentional inconsistency.
image

Kevin Millwood: He faded in mid-summer, then career survival instincts seemed to kick in (or an urgent call from his agent).
image

Mat Latos: He had an amazing stretch of pitching, book-ended by two hideous starts. The Padres sure could have used "May, June, July, or August Latos" during their rough home stretch.
image



"The commonality between science and art is in trying to see profoundly - to develop strategies of seeing and showing." - Edward Tufte.

Feel free to send comments, questions, and suggestions to Kevin via email.



Comments

Bob B. said...

This is pretty cool! I really like how these end up looking and the story they tell. Thanks!

Posted 02/28  at  01:55 PM
David said...

I definitely agree that these are better to look at than traditional graphs.  How were they generated?  Is there an easy way to do them?

Posted 02/28  at  07:39 PM
S.F. Giangst said...

A simple line chart with a filled area under the line would have sufficed, i.e. put zero on the bottom. Improve it perhaps by adding a horizontal line through the game score value for the season which tends to set likelihood of winning p = 0.5.

Posted 02/28  at  10:50 PM
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