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What is the difference between "pitch values" and "pitch f/x pitch values?"

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The two stats apparently rely on slightly different pitch classifications--where do the classifications for "pitch values" come from? Are both stats linear weights? Is one more reliable than the other?
asked Oct 24, 2013 in Sabermetrics by discoverychannel (3 points)

1 Answer

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"Pitch values" is based off of Baseball Info Solutions classification of the different pitch types, while "PITCHf/x pitch values" is based off of Gameday classification of pitch types. Gameday uses an algoryhtm to detrmine pitch type, while BIS uses human observation via video tape (IIRC). Use the PITCHf/x data.
answered Oct 24, 2013 by James Gentile (1,933 points)