Originally posted by nny
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I was looking at brooksbaseball (thanks to whoever tipped me off to this site). It could all be going into his 4-seamer. Fangraphs does have him throwing a 2 seamer 23.2% of the time versus 1.4% in 2014. The movement is just way off of where it should be. His 4-seamer is moving more than last year and that movement could be accounted for with weighted averages of the sinker and 4 seamer from 2014.
As someone who's used similar machine learning algorithms if their classifications are misclassifying things at rates like this it's a problem as they should be much more consistent than this. It's like they don't utilize the previous years data to inform the algorithm.
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