Posted By Sean S

One thing I noticed with the pitch f/x data for 2009, just about every pitch thrown by Tim Wakefield was classified as a knuckleball.  That can't be right, I thought he threw in a batting practice fastball every now and then.  The data on Fangraphs shows this is true, he threw the fastball about 10% of the time.

I think the difference here is Fangraphs is using BIS data, which is, last I checked, compiled by scorers watching the game where MLBAM uses an automated pitch classification algorythm.  The knuckleball apparently is as hard to measure as it is to hit, or to catch.  The formula probably leans heavy on the velocity and doesn't want to call what Wakefield throws a fastball.

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Sean S
Maryland, USA


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