February 10, 2012
Now Available for 2012 THT Essentials: Now Available The Hardball Times Baseball Annual 2012, an annual "must buy" for all baseball fans, is now shipping. Read this article to learn more about it.
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Monday, February 08, 2010How do you spot a lefty masher?I was extremely excited to find that our saber-partner, Fangraphs, is now hosting splits data on their site. Lefty/righty splits are something that fascinate me. Ever since I was a little kid, I was awed by the idea of having a "lefty masher" on the bench, just in case an opposing manager brought in a LOOGY, allowing you to pull a quick-one and play for the extra-base hit. However, lefty/right analysis has advanced since my adolescence, and I think this post from MGL is a must read for what I'm talking about. In it he says: IOW, how a batter does against RH pitchers informs us on how he will likely do against LH pitchers and vice versa. Why? Because there is not much of a spread in true platoon splits among ML baseball players yet there is a large spread in overall true hitting talent among ML baseball players. So if we see a large platoon split, like for a player like [Ryan] Howard, it is likely a fluke. If a player does really well versus RH pitchers but terrible against LH pitchers, both the “really well” and the “terrible” numbers are likely fluky and the “truth” is somewhere in between. So MGL's main thesis is that the large discrepancies we see in some players is due to a smaller sample size relative to their overall performance, which is a more useful indicator of their talent and can be applied to platoon splits via regression to come up with a more "stable" number. MGL goes on to do this for Howard, getting an OPS of .805 versus lefties, rather than his actual .719 over the past four years. The question I then have to ask is: how long do we have to wait to believe that a noticeably large split is due to a real ability to mash one side and a true inability to hit even close to as well (relative to the other side) against the other? Unfortunately, we don't have league leader/sortable data on Fangraphs pertaining to splits just yet, but I thought about all the guys that announcers had told me stunk against their same-handed pitching counterparts and looked them up. Here are some interesting names sorted by wRC+ with their same-handed numbers first, opposite second, and plate appearances in parentheses: Ryan Garko: 106 (485), 136 (1229) Carlos Delgado: 107 (1400), 154 (3123) Fernando Tatis: 90 (465), 111 (910) Eric Karros: 83 (312), 134 (737) Jack Cust: 105 (1510), 134 (1373) Some extreme differences there, and these are only the ones that hit me from memory. Obviously MGL and others are not saying that some players don't hit better against opposite hand pitchers; this is clearly true. The question is how much. I'd also like to see how players do split wise over the course of a career. Obviously the skill of hitters diminishes over time, but it'd be interesting to see if the splits are larger. Ryan Howard certainly is not "old" at 30 years old, but his skill set and physical size certainly have shifted over the years. While he was never slender, Howard is certainly a "bigger" guy than he used to be, and probably a good amount slower. Besides that, as players get older they tend to lose some hand-eye skill and bat speed, an effect that may be magnified when facing a pitcher of the same handedness. Here are Howard's wRC+ from 2006-2009, going from overall to versus lefties and then versus righties. 2006: 166, 133, 182 2007: 140, 110, 159 2008: 123, 91, 143 2009: 141, 71, 178 As you can see, that's a 49 point difference in 2006, same in 2007, 52 in 2008, and 107 in 2009. I doubt the difference will be as big in 2010, because I'm sure we can charge a big chunk of the 107 to some luck, but we shouldn't be surprised to see a difference of around 75-90 points. There's still a good amount of work to be done in this area of research, and we should be excited for Fangraphs' new tool. I think the next step is looking to the data to find similar traits in players, both physically and in their numbers, to determine whether their relative success versus opposite-handed pitchers would be indicative of future success, or just white noise. I'm anxious to find out. Jose Tabata in his mid-twenties?Since Neal Huntington became general manager of the Pittsburgh Pirates in September of 2007, the organization has undergone wholesale changes in player evaluation and resource allocation. Gone are the mind-bending days of passing up B.J. Upton and Matt Wieters to save a quick buck, forfeiting staggering amounts of surplus value in those zero-to-six years of service time in the process. Also gone are the days of paying large chunks of cash to veterans on their last legs, such as Matt Morris and Jeromy Burnitz. Click for more... | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||