FanGraphs Baseball - Comments on Pounding the Zone: Walk Rate Peripherals
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What kind of filters did you use to select these pitchers?

Comment by novaether — June 28, 2012 @ 10:37 am

Adam Dunn.

Comment by Danny — June 28, 2012 @ 10:54 am

Doh. Qualified starters since 2002, or the pitch f/x era.

Comment by Eno Sarris — June 28, 2012 @ 11:49 am

Using just 2011 data for pitchers with at least 300 batters faced, I found an interesting quadratic relationship in first-pitch strike percentage, given zone% was in the model. The quadratic relationship suggested that BB% was minimized at an F-strike% of about 71.3%. The p-value for the (centered) quadratic term was 0.051.

I’m thinking if this is true, then f-strike percentages that are quite high might indicate a pitcher that uses fastballs early in the count to get ahead, but can’t finish anyone off with his breaking stuff. It could also be a quirky p-value with only one season of data. Were you able to test for polynomial relationships using your much larger data set?

Comment by Matthias — June 28, 2012 @ 1:41 pm

Eno,

Who were the pitchers at the very top left and very bottom right of the regression line?

Comment by RMD — June 28, 2012 @ 2:53 pm