FanGraphs Baseball


RSS feed for comments on this post.

  1. Could there be some survivor bias that explains the late age up-tick in swing percentage on balls in the zone? I wonder particularly whether these guys might be short stops and other sorts of players who stick around based on their defensive skill set and who have always been high-swing, high-contact (but low power) hitters.

    Comment by philosofool — October 8, 2012 @ 1:15 pm

  2. I do think this study would benefit from separating players in some way based on hitting ability, perhaps based on power. Sammy Sosa and bonds, who was already a patient hitter, experienced big upticks in walk percentage during their careers. And watching them play, they definitely became more selective, which is why they became more productive. I doubt they are isolated scenarios.

    Very interesting though.

    Comment by Crumpled Stiltskin — October 8, 2012 @ 1:40 pm

  3. “The biggest change we see relative to age 21 is for O-Contact%, which decreases almost 5% by the time hitters reach 30 years old.”

    Don’t you mean 40 years old? Or am I reading the graph wrong?

    Comment by Matt Hunter — October 8, 2012 @ 1:57 pm

  4. Fixed, thank you.

    Comment by Bill Petti — October 8, 2012 @ 2:15 pm

  5. There is certainly some survivor issues, here. In the future I want to try and separate out some classes of hitters and get even more granular, provided there is enough data.

    Comment by Bill Petti — October 8, 2012 @ 2:16 pm

  6. Brendan Ryan also switched leagues between his age 28-age 29 seasons, which may have had a significant effect on the mix of pitches he saw and the plate discipline stats that resulted.

    Comment by joser — October 8, 2012 @ 2:20 pm

  7. I’ve done some study on hitter aging. One additional consideration I looked at is years in MLB. I found that most improvements happen from MLB-experience-years 4-6. It takes about 5 years for hitters to become what they will become.

    Comment by — October 8, 2012 @ 4:18 pm

  8. Fascinating. Just because of general interest, it would be interesting where Barry Bonds lay among the curves as an individual.

    Comment by channelclemente — October 9, 2012 @ 3:53 pm

Sorry, the comment form is closed at this time.

Close this window.

0.521 Powered by WordPress