Thursday, May 30, 2013
All about checked swings
Ben goes above and beyond to parse the checked-swing data, with a little help from Max et al.
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The year-to-year correlation was 0.34—not strong, but tough to dismiss, given the number of data points and the fact that we aren’t even considering whether the home plate umpire appealed.
Ben reports the number of checked swings is 11807 per year, or probably an average of 150 per umpire. A correlation of 0.34 means that you need about 300 checked swings to get half-signal, half-noise. That's more relevant than something like batting average or ERA!
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