Mailbag: Late Bloomers - Is Mike Carp another Lahair or Morse?
Muddyfrog writes,
Is there any correlation on age arc and large men? The reason I ask is
because we're seeing guys like Bryan LaHair, & Mike Morse peak in their late
twenties. Do you think this may be the case for guys like Smoak, Montero, and
Carp? Or more specifically can you single out a particular group or stereo
type a group of players that tend to peak in their late twenties and early
thirties. What's the median peak age?
Provocative question!
Lots of studies have been done on peak age for the whole population. Here's a series at Hardball Times and here's material from Tom Tango's epic website. A good player has his 95-100% results from about age 23 to about age 29-30.
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But we've known that, in its broad outlines, at least since 1980. To me yours is a much more interesting question: what is the prototype of the player whose curve is right-shifted on this graph?
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Q. What kind of studies have been done?
A. The ones I've seen don't help us. Bill James' "Strong Season Leading Index" is discussed here, among other places.
In that article, the Hardball Times was looking at bustout seasons by Russell Branyan, Aaron Hill and Mark Reynolds, and trying to decide whether those players were "for real." But there are a couple of problemos there that ace us out...
First, James' SSLI is a rotisserie-type device. As with the very similar BaseballHQ "Breakout Index," this formula is merely looking at the obvious to decide what the NEXT season will be. It takes into account age - if you're over 30, you're not likely to have your best season coming up. It takes into account unlucky BABIP. It takes into account the Plexiglass Principle, that players are likely to rebound to their career averages. Stuff like that.
And it's looking for a SINGLE season with up stats. It's not really designed to identify the next Raul Ibanez. I haven't seen any studies that do that, although somebody here may know of some.
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Q. Do pitchers count?