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Thursday, June 09, 2011
Estimating Groundball Rates, based on velocity, trajectory, movement, location
Great job by Josh.
He points out the issue with merging handedness into one chart. Things are clearer if you do 4 charts (hand pitcher x hand batter, or at least two: with and without the platoon advantage). That would probably help for this chart:
For 100mph pitchers, GB rate is very high if you face a RH batter, but very low if you face a LH batter. Except I presume you have a disproportionate number of pitchers who are righties who throw 100mph. So, this chart can just as well say that if you have same-handed players, you get lots of GB at 100mph, but if it’s opposite-handed players, you get very few GB at 100mph.
(Note: The second chart has the y-axis label wrong.)
But, forget that negativity. Just a great article all-round. Big thumbs up.
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