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Tuesday, October 12, 2010
Visual Baseball: Rangers-Rays Game Five Paintomatics
Posted by Kevin Dame
Here's a look at what Rangers and Rays hitters will have flying at them in tonight's deciding Game 5.
"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.
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Kevin,
I think the impact on the viewer is proportional to the area of each circle. I also think that you are sizing the circles with the radius proportional to the fraction of usage of that pitch. But the area is proportional to the square of the radius, so you are greatly increasing the perception of the usage of the most common pitch, usually the fastball. For example, if a pitcher throws 70% fastballs, and 10% each curves, changeups and sliders, I think your circles would be proportioned 49 to 1. Thus biasing the perception of how many fastballs were thrown vs the other pitches. You should set the radius to the square root of the percentage.