Ground-ball rate stabilizes fairly quickly. Usually, you’ll hear this factoid in the first month of the season as we look at April stats and try to render prognoses on the rest of the season. Of course, ‘stabilizing’ means that there’s about a 50/50 chance the data is meaningful in that small sample.
Hidden in that fact is the key to today’s look at the player population. Players change. They change their batted ball mixes in season, too, not just in April. And if you look at month-long samples, you’re pretty close to that stabilization point again. You want about 30 games to believe in ground ball numbers, and your qualified batters typically play around 25 games in a month.
And, since we’re now comparing July to June instead of April to all of last year, and we’ve already admitted that players change their mixes, it’s useful to remember that this is not some sort of skeleton key that will figure it all out for us. Still, we need to know which players are altering their batted ball mixes, because it might stick, and it might mean something going forward.
And for Christian Yelich, Adam Eaton, Brandon Crawford and even Jung-ho Kang… we could be seeing the future.
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