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Klaassen Explains It All: Why Relying On A Pitcher’s Single Season ERA, WHIP, Or BABIP Is A Bad Idea

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Following up an article on how well hitter’s metrics correlate year to year, the artist formerly known as devil_fingers takes an updated look at the correlation of basic pitching metrics using data from 1955 through 2012. He does the same for metrics including batted ball classifications using data from 2002 through 2012 (the availability of reliable data only goes back to 2002). Not surprisingly, groundball rate (GB%), strikeout rate, walk rate, K/BB ratio, and xFIP correlate highly, while WHIP, ERA, BABIP, line drive rate (LD%), and home run per fly ball (HR/FB) do not.

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